def circuit(weights):
qml.RX(weights[0], wires=0)
qml.RZ(weights[1], wires=1)
return qml.expval(qml.PauliZ(0) @ qml.PauliZ(1))
def circuit(x, w=None):
qml.RZ(x, wires=w)
return qml.expval(qml.PauliX(w))
def _decomposition_2_cnots(U, wires):
r"""If 2 CNOTs are required, we can write the circuit as
-╭U- = -A--╭X--RZ(d)--╭X--C-
-╰U- = -B--╰C--RX(p)--╰C--D-
We need to find the angles for the Z and X rotations such that the inner
part has the same spectrum as U, and then we can recover A, B, C, D.
"""
# Compute the rotation angles
u = math.dot(Edag, math.dot(U, E))
gammaU = math.dot(u, math.T(u))
evs, _ = math.linalg.eig(gammaU)
# These choices are based on Proposition III.3 of
# https://arxiv.org/abs/quant-ph/0308045
# There is, however, a special case where the circuit has the form
# -╭U- = -A--╭C--╭X--C-
# -╰U- = -B--╰X--╰C--D-
#
# or some variant of this, where the two CNOTs are adjacent.
#
# What happens here is that the set of evs is -1, -1, 1, 1 and we can write
# -╭U- = -A--╭X--SZ--╭X--C-
# -╰U- = -B--╰C--SX--╰C--D-
# where SZ and SX are square roots of Z and X respectively. (This
# decomposition comes from using Hadamards to flip the direction of the
# first CNOT, and then decomposing them and merging single-qubit gates.) For
# some reason this case is not handled properly with the full algorithm, so
# we treat it separately.
sorted_evs = math.sort(math.real(evs))
if math.allclose(sorted_evs, [-1, -1, 1, 1]):
interior_decomp = [
qml.CNOT(wires=[wires[1], wires[0]]),
qml.S(wires=wires[0]),
qml.SX(wires=wires[1]),
qml.CNOT(wires=[wires[1], wires[0]]),
]
# S \otimes SX
inner_matrix = S_SX
else:
# For the non-special case, the eigenvalues come in conjugate pairs.
# We need to find two non-conjugate eigenvalues to extract the angles.
x = math.angle(evs[0])
y = math.angle(evs[1])
# If it was the conjugate, grab a different eigenvalue.
if math.allclose(x, -y):
y = math.angle(evs[2])
delta = (x + y) / 2
phi = (x - y) / 2
interior_decomp = [
qml.CNOT(wires=[wires[1], wires[0]]),
qml.RZ(delta, wires=wires[0]),
qml.RX(phi, wires=wires[1]),
qml.CNOT(wires=[wires[1], wires[0]]),
]
RZd = qml.RZ(math.cast_like(delta, 1j), wires=0).matrix
RXp = qml.RX(phi, wires=0).matrix
inner_matrix = math.kron(RZd, RXp)
# We need the matrix representation of this interior part, V, in order to
# decompose U = (A \otimes B) V (C \otimes D)
V = math.dot(math.cast_like(CNOT10, U),
math.dot(inner_matrix, math.cast_like(CNOT10, U)))
# Now we find the A, B, C, D in SU(2), and return the decomposition
A, B, C, D = _extract_su2su2_prefactors(U, V)
A_ops = zyz_decomposition(A, wires[0])
B_ops = zyz_decomposition(B, wires[1])
C_ops = zyz_decomposition(C, wires[0])
D_ops = zyz_decomposition(D, wires[1])
return C_ops + D_ops + interior_decomp + A_ops + B_ops
def circuit(reused_param, other_param):
qml.RX(extra_param, wires=[0])
qml.RY(reused_param, wires=[0])
qml.RZ(other_param, wires=[0])
qml.RX(reused_param, wires=[0])
return qml.expval(qml.PauliZ(0))
def circuit(x):
qml.RZ(x, wires=[1]).inv()
qml.RZ(x, wires=[1]).inv().inv()
return qml.expval(qml.PauliX(0)), qml.expval(qml.PauliZ(1))
class TestRepresentationResolver:
"""Test the RepresentationResolver class."""
@pytest.mark.parametrize(
"list,element,index,list_after",
[
([1, 2, 3], 2, 1, [1, 2, 3]),
([1, 2, 2, 3], 2, 1, [1, 2, 2, 3]),
([1, 2, 3], 4, 3, [1, 2, 3, 4]),
],
)
def test_index_of_array_or_append(self, list, element, index, list_after):
"""Test the method index_of_array_or_append."""
assert RepresentationResolver.index_of_array_or_append(element,
list) == index
assert list == list_after
@pytest.mark.parametrize("par,expected", [
(3, "3"),
(5.236422, "5.236"),
])
def test_single_parameter_representation(self,
unicode_representation_resolver,
par, expected):
"""Test that single parameters are properly resolved."""
assert unicode_representation_resolver.single_parameter_representation(
par) == expected
def test_single_parameter_representation_variable(
self, unicode_representation_resolver, variable):
"""Test that variables are properly resolved."""
assert unicode_representation_resolver.single_parameter_representation(
variable) == "2"
def test_single_parameter_representation_kwarg_variable(
self, unicode_representation_resolver, kwarg_variable):
"""Test that kwarg variables are properly resolved."""
assert (unicode_representation_resolver.
single_parameter_representation(kwarg_variable) == "1")
@pytest.mark.parametrize("par,expected", [
(3, "3"),
(5.236422, "5.236"),
])
def test_single_parameter_representation_varnames(
self, unicode_representation_resolver_varnames, par, expected):
"""Test that single parameters are properly resolved when show_variable_names is True."""
assert (unicode_representation_resolver_varnames.
single_parameter_representation(par) == expected)
def test_single_parameter_representation_variable_varnames(
self, unicode_representation_resolver_varnames, variable):
"""Test that variables are properly resolved when show_variable_names is True."""
assert (unicode_representation_resolver_varnames.
single_parameter_representation(variable) == "test")
def test_single_parameter_representation_kwarg_variable_varnames(
self, unicode_representation_resolver_varnames, kwarg_variable):
"""Test that kwarg variables are properly resolved when show_variable_names is True."""
assert (
unicode_representation_resolver_varnames.
single_parameter_representation(kwarg_variable) == "kwarg_test")
@pytest.mark.parametrize(
"op,wire,target",
[
(qml.PauliX(wires=[1]), 1, "X"),
(qml.CNOT(wires=[0, 1]), 1, "X"),
(qml.CNOT(wires=[0, 1]), 0, "C"),
(qml.Toffoli(wires=[0, 2, 1]), 1, "X"),
(qml.Toffoli(wires=[0, 2, 1]), 0, "C"),
(qml.Toffoli(wires=[0, 2, 1]), 2, "C"),
(qml.CSWAP(wires=[0, 2, 1]), 1, "SWAP"),
(qml.CSWAP(wires=[0, 2, 1]), 2, "SWAP"),
(qml.CSWAP(wires=[0, 2, 1]), 0, "C"),
(qml.PauliY(wires=[1]), 1, "Y"),
(qml.PauliZ(wires=[1]), 1, "Z"),
(qml.CZ(wires=[0, 1]), 1, "Z"),
(qml.CZ(wires=[0, 1]), 0, "C"),
(qml.Identity(wires=[1]), 1, "I"),
(qml.Hadamard(wires=[1]), 1, "H"),
(qml.PauliRot(3.14, "XX", wires=[0, 1]), 1, "RX(3.14)"),
(qml.PauliRot(3.14, "YZ", wires=[0, 1]), 1, "RZ(3.14)"),
(qml.PauliRot(3.14, "IXYZI", wires=[0, 1, 2, 3, 4
]), 0, "RI(3.14)"),
(qml.PauliRot(3.14, "IXYZI", wires=[0, 1, 2, 3, 4
]), 1, "RX(3.14)"),
(qml.PauliRot(3.14, "IXYZI", wires=[0, 1, 2, 3, 4
]), 2, "RY(3.14)"),
(qml.PauliRot(3.14, "IXYZI", wires=[0, 1, 2, 3, 4
]), 3, "RZ(3.14)"),
(qml.PauliRot(3.14, "IXYZI", wires=[0, 1, 2, 3, 4
]), 4, "RI(3.14)"),
(qml.MultiRZ(3.14, wires=[0, 1]), 0, "RZ(3.14)"),
(qml.MultiRZ(3.14, wires=[0, 1]), 1, "RZ(3.14)"),
(qml.CRX(3.14, wires=[0, 1]), 1, "RX(3.14)"),
(qml.CRX(3.14, wires=[0, 1]), 0, "C"),
(qml.CRY(3.14, wires=[0, 1]), 1, "RY(3.14)"),
(qml.CRY(3.14, wires=[0, 1]), 0, "C"),
(qml.CRZ(3.14, wires=[0, 1]), 1, "RZ(3.14)"),
(qml.CRZ(3.14, wires=[0, 1]), 0, "C"),
(qml.CRot(3.14, 2.14, 1.14, wires=[0, 1
]), 1, "Rot(3.14, 2.14, 1.14)"),
(qml.CRot(3.14, 2.14, 1.14, wires=[0, 1]), 0, "C"),
(qml.PhaseShift(3.14, wires=[0]), 0, "Rϕ(3.14)"),
(qml.Beamsplitter(1, 2, wires=[0, 1]), 1, "BS(1, 2)"),
(qml.Beamsplitter(1, 2, wires=[0, 1]), 0, "BS(1, 2)"),
(qml.Squeezing(1, 2, wires=[1]), 1, "S(1, 2)"),
(qml.TwoModeSqueezing(1, 2, wires=[0, 1]), 1, "S(1, 2)"),
(qml.TwoModeSqueezing(1, 2, wires=[0, 1]), 0, "S(1, 2)"),
(qml.Displacement(1, 2, wires=[1]), 1, "D(1, 2)"),
(qml.NumberOperator(wires=[1]), 1, "n"),
(qml.Rotation(3.14, wires=[1]), 1, "R(3.14)"),
(qml.ControlledAddition(3.14, wires=[0, 1]), 1, "X(3.14)"),
(qml.ControlledAddition(3.14, wires=[0, 1]), 0, "C"),
(qml.ControlledPhase(3.14, wires=[0, 1]), 1, "Z(3.14)"),
(qml.ControlledPhase(3.14, wires=[0, 1]), 0, "C"),
(qml.ThermalState(3, wires=[1]), 1, "Thermal(3)"),
(
qml.GaussianState(
np.array([1, 2]), np.array([[2, 0], [0, 2]]), wires=[1]),
1,
"Gaussian(M0,M1)",
),
(qml.QuadraticPhase(3.14, wires=[1]), 1, "P(3.14)"),
(qml.RX(3.14, wires=[1]), 1, "RX(3.14)"),
(qml.S(wires=[2]), 2, "S"),
(qml.T(wires=[2]), 2, "T"),
(qml.RX(3.14, wires=[1]), 1, "RX(3.14)"),
(qml.RY(3.14, wires=[1]), 1, "RY(3.14)"),
(qml.RZ(3.14, wires=[1]), 1, "RZ(3.14)"),
(qml.Rot(3.14, 2.14, 1.14, wires=[1]), 1, "Rot(3.14, 2.14, 1.14)"),
(qml.U1(3.14, wires=[1]), 1, "U1(3.14)"),
(qml.U2(3.14, 2.14, wires=[1]), 1, "U2(3.14, 2.14)"),
(qml.U3(3.14, 2.14, 1.14, wires=[1]), 1, "U3(3.14, 2.14, 1.14)"),
(qml.BasisState(np.array([0, 1, 0]), wires=[1, 2, 3]), 1, "|0⟩"),
(qml.BasisState(np.array([0, 1, 0]), wires=[1, 2, 3]), 2, "|1⟩"),
(qml.BasisState(np.array([0, 1, 0]), wires=[1, 2, 3]), 3, "|0⟩"),
(qml.QubitStateVector(np.array([0, 1, 0, 0]),
wires=[1, 2]), 1, "QubitStateVector(M0)"),
(qml.QubitStateVector(np.array([0, 1, 0, 0]),
wires=[1, 2]), 2, "QubitStateVector(M0)"),
(qml.QubitUnitary(np.eye(2), wires=[1]), 1, "U0"),
(qml.QubitUnitary(np.eye(4), wires=[1, 2]), 2, "U0"),
(qml.Kerr(3.14, wires=[1]), 1, "Kerr(3.14)"),
(qml.CrossKerr(3.14, wires=[1, 2]), 1, "CrossKerr(3.14)"),
(qml.CrossKerr(3.14, wires=[1, 2]), 2, "CrossKerr(3.14)"),
(qml.CubicPhase(3.14, wires=[1]), 1, "V(3.14)"),
(qml.Interferometer(np.eye(4), wires=[1, 3
]), 1, "Interferometer(M0)"),
(qml.Interferometer(np.eye(4), wires=[1, 3
]), 3, "Interferometer(M0)"),
(qml.CatState(3.14, 2.14, 1,
wires=[1]), 1, "CatState(3.14, 2.14, 1)"),
(qml.CoherentState(3.14, 2.14,
wires=[1]), 1, "CoherentState(3.14, 2.14)"),
(
qml.FockDensityMatrix(np.kron(np.eye(4), np.eye(4)),
wires=[1, 2]),
1,
"FockDensityMatrix(M0)",
),
(
qml.FockDensityMatrix(np.kron(np.eye(4), np.eye(4)),
wires=[1, 2]),
2,
"FockDensityMatrix(M0)",
),
(
qml.DisplacedSqueezedState(3.14, 2.14, 1.14, 0.14, wires=[1]),
1,
"DisplacedSqueezedState(3.14, 2.14, 1.14, 0.14)",
),
(qml.FockState(7, wires=[1]), 1, "|7⟩"),
(qml.FockStateVector(np.array([4, 5, 7]), wires=[1, 2, 3
]), 1, "|4⟩"),
(qml.FockStateVector(np.array([4, 5, 7]), wires=[1, 2, 3
]), 2, "|5⟩"),
(qml.FockStateVector(np.array([4, 5, 7]), wires=[1, 2, 3
]), 3, "|7⟩"),
(qml.SqueezedState(3.14, 2.14,
wires=[1]), 1, "SqueezedState(3.14, 2.14)"),
(qml.Hermitian(np.eye(4), wires=[1, 2]), 1, "H0"),
(qml.Hermitian(np.eye(4), wires=[1, 2]), 2, "H0"),
(qml.X(wires=[1]), 1, "x"),
(qml.P(wires=[1]), 1, "p"),
(qml.FockStateProjector(np.array([4, 5, 7]),
wires=[1, 2, 3]), 1, "|4,5,7╳4,5,7|"),
(
qml.PolyXP(np.array([1, 2, 0, -1.3, 6]), wires=[1]),
2,
"1+2x₀-1.3x₁+6p₁",
),
(
qml.PolyXP(np.array([[1.2, 2.3, 4.5], [-1.2, 1.2, -1.5],
[-1.3, 4.5, 2.3]]),
wires=[1]),
1,
"1.2+1.1x₀+3.2p₀+1.2x₀²+2.3p₀²+3x₀p₀",
),
(
qml.PolyXP(
np.array([
[1.2, 2.3, 4.5, 0, 0],
[-1.2, 1.2, -1.5, 0, 0],
[-1.3, 4.5, 2.3, 0, 0],
[0, 2.6, 0, 0, 0],
[0, 0, 0, -4.7, -1.0],
]),
wires=[1],
),
1,
"1.2+1.1x₀+3.2p₀+1.2x₀²+2.3p₀²+3x₀p₀+2.6x₀x₁-p₁²-4.7x₁p₁",
),
(qml.QuadOperator(3.14, wires=[1]), 1, "cos(3.14)x+sin(3.14)p"),
(qml.PauliX(wires=[1]).inv(), 1, "X⁻¹"),
(qml.CNOT(wires=[0, 1]).inv(), 1, "X⁻¹"),
(qml.CNOT(wires=[0, 1]).inv(), 0, "C"),
(qml.Toffoli(wires=[0, 2, 1]).inv(), 1, "X⁻¹"),
(qml.Toffoli(wires=[0, 2, 1]).inv(), 0, "C"),
(qml.Toffoli(wires=[0, 2, 1]).inv(), 2, "C"),
],
)
def test_operator_representation_unicode(self,
unicode_representation_resolver,
op, wire, target):
"""Test that an Operator instance is properly resolved."""
assert unicode_representation_resolver.operator_representation(
op, wire) == target
@pytest.mark.parametrize(
"op,wire,target",
[
(qml.PauliX(wires=[1]), 1, "X"),
(qml.CNOT(wires=[0, 1]), 1, "X"),
(qml.CNOT(wires=[0, 1]), 0, "C"),
(qml.Toffoli(wires=[0, 2, 1]), 1, "X"),
(qml.Toffoli(wires=[0, 2, 1]), 0, "C"),
(qml.Toffoli(wires=[0, 2, 1]), 2, "C"),
(qml.CSWAP(wires=[0, 2, 1]), 1, "SWAP"),
(qml.CSWAP(wires=[0, 2, 1]), 2, "SWAP"),
(qml.CSWAP(wires=[0, 2, 1]), 0, "C"),
(qml.PauliY(wires=[1]), 1, "Y"),
(qml.PauliZ(wires=[1]), 1, "Z"),
(qml.CZ(wires=[0, 1]), 1, "Z"),
(qml.CZ(wires=[0, 1]), 0, "C"),
(qml.Identity(wires=[1]), 1, "I"),
(qml.Hadamard(wires=[1]), 1, "H"),
(qml.CRX(3.14, wires=[0, 1]), 1, "RX(3.14)"),
(qml.CRX(3.14, wires=[0, 1]), 0, "C"),
(qml.CRY(3.14, wires=[0, 1]), 1, "RY(3.14)"),
(qml.CRY(3.14, wires=[0, 1]), 0, "C"),
(qml.CRZ(3.14, wires=[0, 1]), 1, "RZ(3.14)"),
(qml.CRZ(3.14, wires=[0, 1]), 0, "C"),
(qml.CRot(3.14, 2.14, 1.14, wires=[0, 1
]), 1, "Rot(3.14, 2.14, 1.14)"),
(qml.CRot(3.14, 2.14, 1.14, wires=[0, 1]), 0, "C"),
(qml.PhaseShift(3.14, wires=[0]), 0, "Rϕ(3.14)"),
(qml.Beamsplitter(1, 2, wires=[0, 1]), 1, "BS(1, 2)"),
(qml.Beamsplitter(1, 2, wires=[0, 1]), 0, "BS(1, 2)"),
(qml.Squeezing(1, 2, wires=[1]), 1, "S(1, 2)"),
(qml.TwoModeSqueezing(1, 2, wires=[0, 1]), 1, "S(1, 2)"),
(qml.TwoModeSqueezing(1, 2, wires=[0, 1]), 0, "S(1, 2)"),
(qml.Displacement(1, 2, wires=[1]), 1, "D(1, 2)"),
(qml.NumberOperator(wires=[1]), 1, "n"),
(qml.Rotation(3.14, wires=[1]), 1, "R(3.14)"),
(qml.ControlledAddition(3.14, wires=[0, 1]), 1, "X(3.14)"),
(qml.ControlledAddition(3.14, wires=[0, 1]), 0, "C"),
(qml.ControlledPhase(3.14, wires=[0, 1]), 1, "Z(3.14)"),
(qml.ControlledPhase(3.14, wires=[0, 1]), 0, "C"),
(qml.ThermalState(3, wires=[1]), 1, "Thermal(3)"),
(
qml.GaussianState(
np.array([1, 2]), np.array([[2, 0], [0, 2]]), wires=[1]),
1,
"Gaussian(M0,M1)",
),
(qml.QuadraticPhase(3.14, wires=[1]), 1, "P(3.14)"),
(qml.RX(3.14, wires=[1]), 1, "RX(3.14)"),
(qml.S(wires=[2]), 2, "S"),
(qml.T(wires=[2]), 2, "T"),
(qml.RX(3.14, wires=[1]), 1, "RX(3.14)"),
(qml.RY(3.14, wires=[1]), 1, "RY(3.14)"),
(qml.RZ(3.14, wires=[1]), 1, "RZ(3.14)"),
(qml.Rot(3.14, 2.14, 1.14, wires=[1]), 1, "Rot(3.14, 2.14, 1.14)"),
(qml.U1(3.14, wires=[1]), 1, "U1(3.14)"),
(qml.U2(3.14, 2.14, wires=[1]), 1, "U2(3.14, 2.14)"),
(qml.U3(3.14, 2.14, 1.14, wires=[1]), 1, "U3(3.14, 2.14, 1.14)"),
(qml.BasisState(np.array([0, 1, 0]), wires=[1, 2, 3]), 1, "|0>"),
(qml.BasisState(np.array([0, 1, 0]), wires=[1, 2, 3]), 2, "|1>"),
(qml.BasisState(np.array([0, 1, 0]), wires=[1, 2, 3]), 3, "|0>"),
(qml.QubitStateVector(np.array([0, 1, 0, 0]),
wires=[1, 2]), 1, "QubitStateVector(M0)"),
(qml.QubitStateVector(np.array([0, 1, 0, 0]),
wires=[1, 2]), 2, "QubitStateVector(M0)"),
(qml.QubitUnitary(np.eye(2), wires=[1]), 1, "U0"),
(qml.QubitUnitary(np.eye(4), wires=[1, 2]), 2, "U0"),
(qml.Kerr(3.14, wires=[1]), 1, "Kerr(3.14)"),
(qml.CrossKerr(3.14, wires=[1, 2]), 1, "CrossKerr(3.14)"),
(qml.CrossKerr(3.14, wires=[1, 2]), 2, "CrossKerr(3.14)"),
(qml.CubicPhase(3.14, wires=[1]), 1, "V(3.14)"),
(qml.Interferometer(np.eye(4), wires=[1, 3
]), 1, "Interferometer(M0)"),
(qml.Interferometer(np.eye(4), wires=[1, 3
]), 3, "Interferometer(M0)"),
(qml.CatState(3.14, 2.14, 1,
wires=[1]), 1, "CatState(3.14, 2.14, 1)"),
(qml.CoherentState(3.14, 2.14,
wires=[1]), 1, "CoherentState(3.14, 2.14)"),
(
qml.FockDensityMatrix(np.kron(np.eye(4), np.eye(4)),
wires=[1, 2]),
1,
"FockDensityMatrix(M0)",
),
(
qml.FockDensityMatrix(np.kron(np.eye(4), np.eye(4)),
wires=[1, 2]),
2,
"FockDensityMatrix(M0)",
),
(
qml.DisplacedSqueezedState(3.14, 2.14, 1.14, 0.14, wires=[1]),
1,
"DisplacedSqueezedState(3.14, 2.14, 1.14, 0.14)",
),
(qml.FockState(7, wires=[1]), 1, "|7>"),
(qml.FockStateVector(np.array([4, 5, 7]), wires=[1, 2, 3
]), 1, "|4>"),
(qml.FockStateVector(np.array([4, 5, 7]), wires=[1, 2, 3
]), 2, "|5>"),
(qml.FockStateVector(np.array([4, 5, 7]), wires=[1, 2, 3
]), 3, "|7>"),
(qml.SqueezedState(3.14, 2.14,
wires=[1]), 1, "SqueezedState(3.14, 2.14)"),
(qml.Hermitian(np.eye(4), wires=[1, 2]), 1, "H0"),
(qml.Hermitian(np.eye(4), wires=[1, 2]), 2, "H0"),
(qml.X(wires=[1]), 1, "x"),
(qml.P(wires=[1]), 1, "p"),
(qml.FockStateProjector(np.array([4, 5, 7]),
wires=[1, 2, 3]), 1, "|4,5,7X4,5,7|"),
(
qml.PolyXP(np.array([1, 2, 0, -1.3, 6]), wires=[1]),
2,
"1+2x_0-1.3x_1+6p_1",
),
(
qml.PolyXP(np.array([[1.2, 2.3, 4.5], [-1.2, 1.2, -1.5],
[-1.3, 4.5, 2.3]]),
wires=[1]),
1,
"1.2+1.1x_0+3.2p_0+1.2x_0^2+2.3p_0^2+3x_0p_0",
),
(
qml.PolyXP(
np.array([
[1.2, 2.3, 4.5, 0, 0],
[-1.2, 1.2, -1.5, 0, 0],
[-1.3, 4.5, 2.3, 0, 0],
[0, 2.6, 0, 0, 0],
[0, 0, 0, -4.7, 0],
]),
wires=[1],
),
1,
"1.2+1.1x_0+3.2p_0+1.2x_0^2+2.3p_0^2+3x_0p_0+2.6x_0x_1-4.7x_1p_1",
),
(qml.QuadOperator(3.14, wires=[1]), 1, "cos(3.14)x+sin(3.14)p"),
(qml.QuadOperator(3.14, wires=[1]), 1, "cos(3.14)x+sin(3.14)p"),
(qml.PauliX(wires=[1]).inv(), 1, "X^-1"),
(qml.CNOT(wires=[0, 1]).inv(), 1, "X^-1"),
(qml.CNOT(wires=[0, 1]).inv(), 0, "C"),
(qml.Toffoli(wires=[0, 2, 1]).inv(), 1, "X^-1"),
(qml.Toffoli(wires=[0, 2, 1]).inv(), 0, "C"),
(qml.Toffoli(wires=[0, 2, 1]).inv(), 2, "C"),
],
)
def test_operator_representation_ascii(self, ascii_representation_resolver,
op, wire, target):
"""Test that an Operator instance is properly resolved."""
assert ascii_representation_resolver.operator_representation(
op, wire) == target
@pytest.mark.parametrize(
"obs,wire,target",
[
(qml.expval(qml.PauliX(wires=[1])), 1, "⟨X⟩"),
(qml.expval(qml.PauliY(wires=[1])), 1, "⟨Y⟩"),
(qml.expval(qml.PauliZ(wires=[1])), 1, "⟨Z⟩"),
(qml.expval(qml.Hadamard(wires=[1])), 1, "⟨H⟩"),
(qml.expval(qml.Hermitian(np.eye(4), wires=[1, 2])), 1, "⟨H0⟩"),
(qml.expval(qml.Hermitian(np.eye(4), wires=[1, 2])), 2, "⟨H0⟩"),
(qml.expval(qml.NumberOperator(wires=[1])), 1, "⟨n⟩"),
(qml.expval(qml.X(wires=[1])), 1, "⟨x⟩"),
(qml.expval(qml.P(wires=[1])), 1, "⟨p⟩"),
(
qml.expval(
qml.FockStateProjector(np.array([4, 5, 7]),
wires=[1, 2, 3])),
1,
"⟨|4,5,7╳4,5,7|⟩",
),
(
qml.expval(qml.PolyXP(np.array([1, 2, 0, -1.3, 6]), wires=[1
])),
2,
"⟨1+2x₀-1.3x₁+6p₁⟩",
),
(
qml.expval(
qml.PolyXP(np.array([[1.2, 2.3, 4.5], [-1.2, 1.2, -1.5],
[-1.3, 4.5, 2.3]]),
wires=[1])),
1,
"⟨1.2+1.1x₀+3.2p₀+1.2x₀²+2.3p₀²+3x₀p₀⟩",
),
(qml.expval(qml.QuadOperator(
3.14, wires=[1])), 1, "⟨cos(3.14)x+sin(3.14)p⟩"),
(qml.var(qml.PauliX(wires=[1])), 1, "Var[X]"),
(qml.var(qml.PauliY(wires=[1])), 1, "Var[Y]"),
(qml.var(qml.PauliZ(wires=[1])), 1, "Var[Z]"),
(qml.var(qml.Hadamard(wires=[1])), 1, "Var[H]"),
(qml.var(qml.Hermitian(np.eye(4), wires=[1, 2])), 1, "Var[H0]"),
(qml.var(qml.Hermitian(np.eye(4), wires=[1, 2])), 2, "Var[H0]"),
(qml.var(qml.NumberOperator(wires=[1])), 1, "Var[n]"),
(qml.var(qml.X(wires=[1])), 1, "Var[x]"),
(qml.var(qml.P(wires=[1])), 1, "Var[p]"),
(
qml.var(
qml.FockStateProjector(np.array([4, 5, 7]),
wires=[1, 2, 3])),
1,
"Var[|4,5,7╳4,5,7|]",
),
(
qml.var(qml.PolyXP(np.array([1, 2, 0, -1.3, 6]), wires=[1])),
2,
"Var[1+2x₀-1.3x₁+6p₁]",
),
(
qml.var(
qml.PolyXP(np.array([[1.2, 2.3, 4.5], [-1.2, 1.2, -1.5],
[-1.3, 4.5, 2.3]]),
wires=[1])),
1,
"Var[1.2+1.1x₀+3.2p₀+1.2x₀²+2.3p₀²+3x₀p₀]",
),
(qml.var(qml.QuadOperator(
3.14, wires=[1])), 1, "Var[cos(3.14)x+sin(3.14)p]"),
(qml.sample(qml.PauliX(wires=[1])), 1, "Sample[X]"),
(qml.sample(qml.PauliY(wires=[1])), 1, "Sample[Y]"),
(qml.sample(qml.PauliZ(wires=[1])), 1, "Sample[Z]"),
(qml.sample(qml.Hadamard(wires=[1])), 1, "Sample[H]"),
(qml.sample(qml.Hermitian(np.eye(4), wires=[1, 2
])), 1, "Sample[H0]"),
(qml.sample(qml.Hermitian(np.eye(4), wires=[1, 2
])), 2, "Sample[H0]"),
(qml.sample(qml.NumberOperator(wires=[1])), 1, "Sample[n]"),
(qml.sample(qml.X(wires=[1])), 1, "Sample[x]"),
(qml.sample(qml.P(wires=[1])), 1, "Sample[p]"),
(
qml.sample(
qml.FockStateProjector(np.array([4, 5, 7]),
wires=[1, 2, 3])),
1,
"Sample[|4,5,7╳4,5,7|]",
),
(
qml.sample(qml.PolyXP(np.array([1, 2, 0, -1.3, 6]), wires=[1
])),
2,
"Sample[1+2x₀-1.3x₁+6p₁]",
),
(
qml.sample(
qml.PolyXP(np.array([[1.2, 2.3, 4.5], [-1.2, 1.2, -1.5],
[-1.3, 4.5, 2.3]]),
wires=[1])),
1,
"Sample[1.2+1.1x₀+3.2p₀+1.2x₀²+2.3p₀²+3x₀p₀]",
),
(qml.sample(qml.QuadOperator(
3.14, wires=[1])), 1, "Sample[cos(3.14)x+sin(3.14)p]"),
(
qml.expval(
qml.PauliX(wires=[1]) @ qml.PauliY(wires=[2])
@ qml.PauliZ(wires=[3])),
1,
"⟨X ⊗ Y ⊗ Z⟩",
),
(
qml.expval(
qml.FockStateProjector(np.array([4, 5, 7]),
wires=[1, 2, 3])
@ qml.X(wires=[4])),
1,
"⟨|4,5,7╳4,5,7| ⊗ x⟩",
),
(
qml.expval(
qml.FockStateProjector(np.array([4, 5, 7]),
wires=[1, 2, 3])
@ qml.X(wires=[4])),
2,
"⟨|4,5,7╳4,5,7| ⊗ x⟩",
),
(
qml.expval(
qml.FockStateProjector(np.array([4, 5, 7]),
wires=[1, 2, 3])
@ qml.X(wires=[4])),
3,
"⟨|4,5,7╳4,5,7| ⊗ x⟩",
),
(
qml.expval(
qml.FockStateProjector(np.array([4, 5, 7]),
wires=[1, 2, 3])
@ qml.X(wires=[4])),
4,
"⟨|4,5,7╳4,5,7| ⊗ x⟩",
),
(
qml.sample(
qml.Hermitian(np.eye(4), wires=[1, 2]) @ qml.Hermitian(
np.eye(4), wires=[0, 3])),
0,
"Sample[H0 ⊗ H0]",
),
(
qml.sample(
qml.Hermitian(np.eye(4), wires=[1, 2]) @ qml.Hermitian(
2 * np.eye(4), wires=[0, 3])),
0,
"Sample[H0 ⊗ H1]",
),
(qml.probs([0]), 0, "Probs"),
],
)
def test_output_representation_unicode(self,
unicode_representation_resolver,
obs, wire, target):
"""Test that an Observable instance with return type is properly resolved."""
assert unicode_representation_resolver.output_representation(
obs, wire) == target
def test_fallback_output_representation_unicode(
self, unicode_representation_resolver):
"""Test that an Observable instance with return type is properly resolved."""
obs = qml.PauliZ(0)
obs.return_type = "TestReturnType"
assert unicode_representation_resolver.output_representation(
obs, 0) == "TestReturnType[Z]"
@pytest.mark.parametrize(
"obs,wire,target",
[
(qml.expval(qml.PauliX(wires=[1])), 1, "<X>"),
(qml.expval(qml.PauliY(wires=[1])), 1, "<Y>"),
(qml.expval(qml.PauliZ(wires=[1])), 1, "<Z>"),
(qml.expval(qml.Hadamard(wires=[1])), 1, "<H>"),
(qml.expval(qml.Hermitian(np.eye(4), wires=[1, 2])), 1, "<H0>"),
(qml.expval(qml.Hermitian(np.eye(4), wires=[1, 2])), 2, "<H0>"),
(qml.expval(qml.NumberOperator(wires=[1])), 1, "<n>"),
(qml.expval(qml.X(wires=[1])), 1, "<x>"),
(qml.expval(qml.P(wires=[1])), 1, "<p>"),
(
qml.expval(
qml.FockStateProjector(np.array([4, 5, 7]),
wires=[1, 2, 3])),
1,
"<|4,5,7X4,5,7|>",
),
(
qml.expval(qml.PolyXP(np.array([1, 2, 0, -1.3, 6]), wires=[1
])),
2,
"<1+2x_0-1.3x_1+6p_1>",
),
(
qml.expval(
qml.PolyXP(np.array([[1.2, 2.3, 4.5], [-1.2, 1.2, -1.5],
[-1.3, 4.5, 2.3]]),
wires=[1])),
1,
"<1.2+1.1x_0+3.2p_0+1.2x_0^2+2.3p_0^2+3x_0p_0>",
),
(qml.expval(qml.QuadOperator(
3.14, wires=[1])), 1, "<cos(3.14)x+sin(3.14)p>"),
(qml.var(qml.PauliX(wires=[1])), 1, "Var[X]"),
(qml.var(qml.PauliY(wires=[1])), 1, "Var[Y]"),
(qml.var(qml.PauliZ(wires=[1])), 1, "Var[Z]"),
(qml.var(qml.Hadamard(wires=[1])), 1, "Var[H]"),
(qml.var(qml.Hermitian(np.eye(4), wires=[1, 2])), 1, "Var[H0]"),
(qml.var(qml.Hermitian(np.eye(4), wires=[1, 2])), 2, "Var[H0]"),
(qml.var(qml.NumberOperator(wires=[1])), 1, "Var[n]"),
(qml.var(qml.X(wires=[1])), 1, "Var[x]"),
(qml.var(qml.P(wires=[1])), 1, "Var[p]"),
(
qml.var(
qml.FockStateProjector(np.array([4, 5, 7]),
wires=[1, 2, 3])),
1,
"Var[|4,5,7X4,5,7|]",
),
(
qml.var(qml.PolyXP(np.array([1, 2, 0, -1.3, 6]), wires=[1])),
2,
"Var[1+2x_0-1.3x_1+6p_1]",
),
(
qml.var(
qml.PolyXP(np.array([[1.2, 2.3, 4.5], [-1.2, 1.2, -1.5],
[-1.3, 4.5, 2.3]]),
wires=[1])),
1,
"Var[1.2+1.1x_0+3.2p_0+1.2x_0^2+2.3p_0^2+3x_0p_0]",
),
(qml.var(qml.QuadOperator(
3.14, wires=[1])), 1, "Var[cos(3.14)x+sin(3.14)p]"),
(qml.sample(qml.PauliX(wires=[1])), 1, "Sample[X]"),
(qml.sample(qml.PauliY(wires=[1])), 1, "Sample[Y]"),
(qml.sample(qml.PauliZ(wires=[1])), 1, "Sample[Z]"),
(qml.sample(qml.Hadamard(wires=[1])), 1, "Sample[H]"),
(qml.sample(qml.Hermitian(np.eye(4), wires=[1, 2
])), 1, "Sample[H0]"),
(qml.sample(qml.Hermitian(np.eye(4), wires=[1, 2
])), 2, "Sample[H0]"),
(qml.sample(qml.NumberOperator(wires=[1])), 1, "Sample[n]"),
(qml.sample(qml.X(wires=[1])), 1, "Sample[x]"),
(qml.sample(qml.P(wires=[1])), 1, "Sample[p]"),
(
qml.sample(
qml.FockStateProjector(np.array([4, 5, 7]),
wires=[1, 2, 3])),
1,
"Sample[|4,5,7X4,5,7|]",
),
(
qml.sample(qml.PolyXP(np.array([1, 2, 0, -1.3, 6]), wires=[1
])),
2,
"Sample[1+2x_0-1.3x_1+6p_1]",
),
(
qml.sample(
qml.PolyXP(np.array([[1.2, 2.3, 4.5], [-1.2, 1.2, -1.5],
[-1.3, 4.5, 2.3]]),
wires=[1])),
1,
"Sample[1.2+1.1x_0+3.2p_0+1.2x_0^2+2.3p_0^2+3x_0p_0]",
),
(qml.sample(qml.QuadOperator(
3.14, wires=[1])), 1, "Sample[cos(3.14)x+sin(3.14)p]"),
(
qml.expval(
qml.PauliX(wires=[1]) @ qml.PauliY(wires=[2])
@ qml.PauliZ(wires=[3])),
1,
"<X @ Y @ Z>",
),
(
qml.expval(
qml.FockStateProjector(np.array([4, 5, 7]),
wires=[1, 2, 3])
@ qml.X(wires=[4])),
1,
"<|4,5,7X4,5,7| @ x>",
),
(
qml.expval(
qml.FockStateProjector(np.array([4, 5, 7]),
wires=[1, 2, 3])
@ qml.X(wires=[4])),
2,
"<|4,5,7X4,5,7| @ x>",
),
(
qml.expval(
qml.FockStateProjector(np.array([4, 5, 7]),
wires=[1, 2, 3])
@ qml.X(wires=[4])),
3,
"<|4,5,7X4,5,7| @ x>",
),
(
qml.expval(
qml.FockStateProjector(np.array([4, 5, 7]),
wires=[1, 2, 3])
@ qml.X(wires=[4])),
4,
"<|4,5,7X4,5,7| @ x>",
),
(
qml.sample(
qml.Hermitian(np.eye(4), wires=[1, 2]) @ qml.Hermitian(
np.eye(4), wires=[0, 3])),
0,
"Sample[H0 @ H0]",
),
(
qml.sample(
qml.Hermitian(np.eye(4), wires=[1, 2]) @ qml.Hermitian(
2 * np.eye(4), wires=[0, 3])),
0,
"Sample[H0 @ H1]",
),
(qml.probs([0]), 0, "Probs"),
],
)
def test_output_representation_ascii(self, ascii_representation_resolver,
obs, wire, target):
"""Test that an Observable instance with return type is properly resolved."""
assert ascii_representation_resolver.output_representation(
obs, wire) == target
def test_element_representation_none(self,
unicode_representation_resolver):
"""Test that element_representation properly handles None."""
assert unicode_representation_resolver.element_representation(None,
0) == ""
def test_element_representation_str(self, unicode_representation_resolver):
"""Test that element_representation properly handles strings."""
assert unicode_representation_resolver.element_representation(
"Test", 0) == "Test"
def test_element_representation_calls_output(
self, unicode_representation_resolver):
"""Test that element_representation calls output_representation for returned observables."""
unicode_representation_resolver.output_representation = Mock()
obs = qml.sample(qml.PauliX(3))
wire = 3
unicode_representation_resolver.element_representation(obs, wire)
assert unicode_representation_resolver.output_representation.call_args[
0] == (obs, wire)
def test_element_representation_calls_operator(
self, unicode_representation_resolver):
"""Test that element_representation calls operator_representation for all operators that are not returned."""
unicode_representation_resolver.operator_representation = Mock()
op = qml.PauliX(3)
wire = 3
unicode_representation_resolver.element_representation(op, wire)
assert unicode_representation_resolver.operator_representation.call_args[
0] == (op, wire)
def circuit(a, b, c):
qml.RY(a * c, wires=0)
qml.RZ(b, wires=0)
qml.RX(c + c**2 + torch.sin(a), wires=0)
return expval(qml.PauliZ(0))
def f(params1, params2):
qml.RX(0.4, wires=[0])
qml.RZ(params1 * torch.sqrt(params2), wires=[0])
qml.RY(torch.cos(params2), wires=[0])
return qml.expval(qml.PauliZ(0))
def f(params1, params2):
qml.RX(0.4, wires=[0])
qml.RZ(params1 * jax.numpy.sqrt(params2), wires=[0])
qml.RY(jax.numpy.cos(params2), wires=[0])
return qml.expval(qml.PauliZ(0))
def circuit(x, y):
qml.RX(x, wires=[0])
qml.RZ(y, wires=[0])
qml.RX(x, wires=[0])
return qml.expval(qml.PauliZ(0))
def circuit(w, *, x=None):
qml.RX(x[0], wires=[0])
qml.RX(x[1], wires=[1])
qml.RZ(w, wires=[0])
return qml.expval(qml.PauliZ(0)), qml.expval(qml.PauliZ(1))
def circuit(x):
qml._current_context._append_op(CNOT)
qml.RY(0.4, wires=[0])
qml.RZ(-0.2, wires=[1])
return qml.expval(qml.PauliX(0)), qml.expval(qml.PauliZ(1))
def template(x):
for i in range(5):
qml.RZ(i * x, wires=0)
return qml.var(qml.PauliZ(0)), qml.sample(qml.PauliX(1))
def template(x):
for i in range(5):
qml.RZ(i * x, wires=0)
def my_op(a, b, c):
qml.RX(a, wires=2)
qml.RY(b, wires=3)
qml.RZ(c, wires=0)
def circuit_native_pennylane(angle):
qml.RZ(angle, wires=0)
return qml.expval(qml.PauliZ(0))
class TestOperations:
"""Tests that the CirqDevice correctly handles the requested operations."""
def test_reset_on_empty_circuit(self, cirq_device_1_wire):
"""Tests that reset resets the internal circuit when it is not initialized."""
assert cirq_device_1_wire.circuit is None
cirq_device_1_wire.reset()
# Check if circuit is an empty cirq.Circuit
assert cirq_device_1_wire.circuit == cirq.Circuit()
def test_reset_on_full_circuit(self, cirq_device_1_wire):
"""Tests that reset resets the internal circuit when it is filled."""
cirq_device_1_wire.reset()
cirq_device_1_wire.apply([qml.PauliX(0)])
# Assert that the queue is filled
assert list(cirq_device_1_wire.circuit.all_operations())
cirq_device_1_wire.reset()
# Assert that the queue is empty
assert not list(cirq_device_1_wire.circuit.all_operations())
@pytest.mark.parametrize(
"gate,expected_cirq_gates",
[
(qml.PauliX(wires=[0]), [cirq.X]),
(qml.PauliY(wires=[0]), [cirq.Y]),
(qml.PauliZ(wires=[0]), [cirq.Z]),
(qml.PauliX(wires=[0]).inv(), [cirq.X ** -1]),
(qml.PauliY(wires=[0]).inv(), [cirq.Y ** -1]),
(qml.PauliZ(wires=[0]).inv(), [cirq.Z ** -1]),
(qml.Hadamard(wires=[0]), [cirq.H]),
(qml.Hadamard(wires=[0]).inv(), [cirq.H ** -1]),
(qml.S(wires=[0]), [cirq.S]),
(qml.S(wires=[0]).inv(), [cirq.S ** -1]),
(qml.PhaseShift(1.4, wires=[0]), [cirq.ZPowGate(exponent=1.4 / np.pi)]),
(qml.PhaseShift(-1.2, wires=[0]), [cirq.ZPowGate(exponent=-1.2 / np.pi)]),
(qml.PhaseShift(2, wires=[0]), [cirq.ZPowGate(exponent=2 / np.pi)]),
(qml.PhaseShift(1.4, wires=[0]).inv(), [cirq.ZPowGate(exponent=-1.4 / np.pi)],),
(qml.PhaseShift(-1.2, wires=[0]).inv(), [cirq.ZPowGate(exponent=1.2 / np.pi)],),
(qml.PhaseShift(2, wires=[0]).inv(), [cirq.ZPowGate(exponent=-2 / np.pi)]),
(qml.RX(1.4, wires=[0]), [cirq.rx(1.4)]),
(qml.RX(-1.2, wires=[0]), [cirq.rx(-1.2)]),
(qml.RX(2, wires=[0]), [cirq.rx(2)]),
(qml.RX(1.4, wires=[0]).inv(), [cirq.rx(-1.4)]),
(qml.RX(-1.2, wires=[0]).inv(), [cirq.rx(1.2)]),
(qml.RX(2, wires=[0]).inv(), [cirq.rx(-2)]),
(qml.RY(1.4, wires=[0]), [cirq.ry(1.4)]),
(qml.RY(0, wires=[0]), [cirq.ry(0)]),
(qml.RY(-1.3, wires=[0]), [cirq.ry(-1.3)]),
(qml.RY(1.4, wires=[0]).inv(), [cirq.ry(-1.4)]),
(qml.RY(0, wires=[0]).inv(), [cirq.ry(0)]),
(qml.RY(-1.3, wires=[0]).inv(), [cirq.ry(+1.3)]),
(qml.RZ(1.4, wires=[0]), [cirq.rz(1.4)]),
(qml.RZ(-1.1, wires=[0]), [cirq.rz(-1.1)]),
(qml.RZ(1, wires=[0]), [cirq.rz(1)]),
(qml.RZ(1.4, wires=[0]).inv(), [cirq.rz(-1.4)]),
(qml.RZ(-1.1, wires=[0]).inv(), [cirq.rz(1.1)]),
(qml.RZ(1, wires=[0]).inv(), [cirq.rz(-1)]),
(qml.Rot(1.4, 2.3, -1.2, wires=[0]), [cirq.rz(1.4), cirq.ry(2.3), cirq.rz(-1.2)],),
(qml.Rot(1, 2, -1, wires=[0]), [cirq.rz(1), cirq.ry(2), cirq.rz(-1)]),
(qml.Rot(-1.1, 0.2, -1, wires=[0]), [cirq.rz(-1.1), cirq.ry(0.2), cirq.rz(-1)],),
(
qml.Rot(1.4, 2.3, -1.2, wires=[0]).inv(),
[cirq.rz(1.2), cirq.ry(-2.3), cirq.rz(-1.4)],
),
(qml.Rot(1, 2, -1, wires=[0]).inv(), [cirq.rz(1), cirq.ry(-2), cirq.rz(-1)],),
(qml.Rot(-1.1, 0.2, -1, wires=[0]).inv(), [cirq.rz(1), cirq.ry(-0.2), cirq.rz(1.1)],),
(
qml.QubitUnitary(np.array([[1, 0], [0, 1]]), wires=[0]),
[cirq.MatrixGate(np.array([[1, 0], [0, 1]]))],
),
(
qml.QubitUnitary(np.array([[1, 0], [0, -1]]), wires=[0]),
[cirq.MatrixGate(np.array([[1, 0], [0, -1]]))],
),
(
qml.QubitUnitary(np.array([[-1, 1], [1, 1]]) / math.sqrt(2), wires=[0]),
[cirq.MatrixGate(np.array([[-1, 1], [1, 1]]) / math.sqrt(2))],
),
(
qml.QubitUnitary(np.array([[1, 0], [0, 1]]), wires=[0]).inv(),
[cirq.MatrixGate(np.array([[1, 0], [0, 1]])) ** -1],
),
(
qml.QubitUnitary(np.array([[1, 0], [0, -1]]), wires=[0]).inv(),
[cirq.MatrixGate(np.array([[1, 0], [0, -1]])) ** -1],
),
(
qml.QubitUnitary(np.array([[-1, 1], [1, 1]]) / math.sqrt(2), wires=[0]).inv(),
[cirq.MatrixGate(np.array([[-1, 1], [1, 1]]) / math.sqrt(2)) ** -1],
),
],
)
def test_apply_single_wire(self, cirq_device_1_wire, gate, expected_cirq_gates):
"""Tests that apply adds the correct gates to the circuit for single-qubit gates."""
cirq_device_1_wire.reset()
cirq_device_1_wire.apply([gate])
ops = list(cirq_device_1_wire.circuit.all_operations())
assert len(ops) == len(expected_cirq_gates)
for i in range(len(ops)):
assert ops[i]._gate == expected_cirq_gates[i]
@pytest.mark.parametrize(
"gate,expected_cirq_gates",
[
(qml.CNOT(wires=[0, 1]), [cirq.CNOT]),
(qml.CNOT(wires=[0, 1]).inv(), [cirq.CNOT ** -1]),
(qml.SWAP(wires=[0, 1]), [cirq.SWAP]),
(qml.SWAP(wires=[0, 1]).inv(), [cirq.SWAP ** -1]),
(qml.CZ(wires=[0, 1]), [cirq.CZ]),
(qml.CZ(wires=[0, 1]).inv(), [cirq.CZ ** -1]),
(qml.CRX(1.4, wires=[0, 1]), [cirq.ControlledGate(cirq.rx(1.4))]),
(qml.CRX(-1.2, wires=[0, 1]), [cirq.ControlledGate(cirq.rx(-1.2))]),
(qml.CRX(2, wires=[0, 1]), [cirq.ControlledGate(cirq.rx(2))]),
(qml.CRX(1.4, wires=[0, 1]).inv(), [cirq.ControlledGate(cirq.rx(-1.4))]),
(qml.CRX(-1.2, wires=[0, 1]).inv(), [cirq.ControlledGate(cirq.rx(1.2))]),
(qml.CRX(2, wires=[0, 1]).inv(), [cirq.ControlledGate(cirq.rx(-2))]),
(qml.CRY(1.4, wires=[0, 1]), [cirq.ControlledGate(cirq.ry(1.4))]),
(qml.CRY(0, wires=[0, 1]), [cirq.ControlledGate(cirq.ry(0))]),
(qml.CRY(-1.3, wires=[0, 1]), [cirq.ControlledGate(cirq.ry(-1.3))]),
(qml.CRY(1.4, wires=[0, 1]).inv(), [cirq.ControlledGate(cirq.ry(-1.4))]),
(qml.CRY(0, wires=[0, 1]).inv(), [cirq.ControlledGate(cirq.ry(0))]),
(qml.CRY(-1.3, wires=[0, 1]).inv(), [cirq.ControlledGate(cirq.ry(1.3))]),
(qml.CRZ(1.4, wires=[0, 1]), [cirq.ControlledGate(cirq.rz(1.4))]),
(qml.CRZ(-1.1, wires=[0, 1]), [cirq.ControlledGate(cirq.rz(-1.1))]),
(qml.CRZ(1, wires=[0, 1]), [cirq.ControlledGate(cirq.rz(1))]),
(qml.CRZ(1.4, wires=[0, 1]).inv(), [cirq.ControlledGate(cirq.rz(-1.4))]),
(qml.CRZ(-1.1, wires=[0, 1]).inv(), [cirq.ControlledGate(cirq.rz(1.1))]),
(qml.CRZ(1, wires=[0, 1]).inv(), [cirq.ControlledGate(cirq.rz(-1))]),
(
qml.CRot(1.4, 2.3, -1.2, wires=[0, 1]),
[
cirq.ControlledGate(cirq.rz(1.4)),
cirq.ControlledGate(cirq.ry(2.3)),
cirq.ControlledGate(cirq.rz(-1.2)),
],
),
(
qml.CRot(1, 2, -1, wires=[0, 1]),
[
cirq.ControlledGate(cirq.rz(1)),
cirq.ControlledGate(cirq.ry(2)),
cirq.ControlledGate(cirq.rz(-1)),
],
),
(
qml.CRot(-1.1, 0.2, -1, wires=[0, 1]),
[
cirq.ControlledGate(cirq.rz(-1.1)),
cirq.ControlledGate(cirq.ry(0.2)),
cirq.ControlledGate(cirq.rz(-1)),
],
),
(
qml.CRot(1.4, 2.3, -1.2, wires=[0, 1]).inv(),
[
cirq.ControlledGate(cirq.rz(1.2)),
cirq.ControlledGate(cirq.ry(-2.3)),
cirq.ControlledGate(cirq.rz(-1.4)),
],
),
(
qml.CRot(1, 2, -1, wires=[0, 1]).inv(),
[
cirq.ControlledGate(cirq.rz(1)),
cirq.ControlledGate(cirq.ry(-2)),
cirq.ControlledGate(cirq.rz(-1)),
],
),
(
qml.CRot(-1.1, 0.2, -1, wires=[0, 1]).inv(),
[
cirq.ControlledGate(cirq.rz(1)),
cirq.ControlledGate(cirq.ry(-0.2)),
cirq.ControlledGate(cirq.rz(1.1)),
],
),
(qml.QubitUnitary(np.eye(4), wires=[0, 1]), [cirq.MatrixGate(np.eye(4))]),
(
qml.QubitUnitary(
np.array([[0, 0, 0, 1], [0, 0, 1, 0], [0, 1, 0, 0], [1, 0, 0, 0]]),
wires=[0, 1],
),
[
cirq.MatrixGate(
np.array([[0, 0, 0, 1], [0, 0, 1, 0], [0, 1, 0, 0], [1, 0, 0, 0]])
)
],
),
(
qml.QubitUnitary(
np.array([[1, -1, -1, 1], [-1, -1, 1, 1], [-1, 1, -1, 1], [1, 1, 1, 1]]) / 2,
wires=[0, 1],
),
[
cirq.MatrixGate(
np.array([[1, -1, -1, 1], [-1, -1, 1, 1], [-1, 1, -1, 1], [1, 1, 1, 1],])
/ 2
)
],
),
(qml.QubitUnitary(np.eye(4), wires=[0, 1]).inv(), [cirq.MatrixGate(np.eye(4)) ** -1],),
(
qml.QubitUnitary(
np.array([[0, 0, 0, 1], [0, 0, 1, 0], [0, 1, 0, 0], [1, 0, 0, 0]]),
wires=[0, 1],
).inv(),
[
cirq.MatrixGate(
np.array([[0, 0, 0, 1], [0, 0, 1, 0], [0, 1, 0, 0], [1, 0, 0, 0]])
)
** -1
],
),
(
qml.QubitUnitary(
np.array([[1, -1, -1, 1], [-1, -1, 1, 1], [-1, 1, -1, 1], [1, 1, 1, 1]]) / 2,
wires=[0, 1],
).inv(),
[
cirq.MatrixGate(
np.array([[1, -1, -1, 1], [-1, -1, 1, 1], [-1, 1, -1, 1], [1, 1, 1, 1],])
/ 2
)
** -1
],
),
],
)
def test_apply_two_wires(self, cirq_device_2_wires, gate, expected_cirq_gates):
"""Tests that apply adds the correct gates to the circuit for two-qubit gates."""
cirq_device_2_wires.reset()
cirq_device_2_wires.apply([gate])
ops = list(cirq_device_2_wires.circuit.all_operations())
assert len(ops) == len(expected_cirq_gates)
for i in range(len(ops)):
assert ops[i].gate == expected_cirq_gates[i]
def cost(p1, p2):
qml.RX(extra_param, wires=[0])
qml.RY(p1, wires=[0])
qml.RZ(p2, wires=[0])
qml.RX(p1, wires=[0])
return qml.expval(qml.PauliZ(0))
def decomposition(phi, wires):
return [
qml.CNOT(wires=wires),
qml.RZ(phi, wires=[wires[1]]),
qml.CNOT(wires=wires),
]
def expand_hadamards(tape, x):
for op in tape.operations + tape.measurements:
if op.name == "Hadamard":
qml.RZ(x, wires=op.wires)
else:
op.queue()
def circuit(x):
qml.RZ(x, wires=[0])
return qml.expval(qml.PauliZ(0))
def circuit():
qml.Hadamard(wires=0)
qml.RZ(np.pi / 4, wires=0)
return qml.expval(qml.PauliZ(0))
def circuit(x):
qml.RX(x, wires=[0])
qml.CNOT(wires=[0, 1], do_queue=False)
qml.RY(0.4, wires=[0])
qml.RZ(-0.2, wires=[1], do_queue=False)
return qml.expval(qml.PauliX(0)), qml.expval(qml.PauliZ(1))
def circuit(x):
qml.RX(x[0], wires=0)
qml.RY(x[1], wires=1)
qml.RZ(x[2], wires=1)
qml.CNOT(wires=[0, 1])
return qml.expval(qml.PauliX(0) @ qml.PauliY(1))
(qml.Hadamard(wires=0), H),
(qml.S(wires=0), S),
(qml.T(wires=0), T),
(qml.PauliX(wires=0).inv(), X.conj().T),
(qml.PauliY(wires=0).inv(), Y.conj().T),
(qml.PauliZ(wires=0).inv(), Z.conj().T),
(qml.Hadamard(wires=0).inv(), H.conj().T),
(qml.S(wires=0).inv(), S.conj().T),
(qml.T(wires=0).inv(), T.conj().T),
]
# list of all parametrized single-qubit gates
single_qubit_param = [
(qml.RX(0, wires=0), rx),
(qml.RY(0, wires=0), ry),
(qml.RZ(0, wires=0), rz),
(qml.PhaseShift(0, wires=0), phase_shift),
(qml.RX(0, wires=0).inv(), lambda theta: rx(-theta)),
(qml.RY(0, wires=0).inv(), lambda theta: ry(-theta)),
(qml.RZ(0, wires=0).inv(), lambda theta: rz(-theta)),
(qml.PhaseShift(0, wires=0).inv(), lambda theta: phase_shift(-theta)),
]
# list of all non-parametrized two-qubit gates
two_qubit = [
(qml.CNOT(wires=[0, 1]), CNOT),
(qml.SWAP(wires=[0, 1]), SWAP),
(qml.CZ(wires=[0, 1]), CZ),
(qml.CNOT(wires=[0, 1]).inv(), CNOT.conj().T),
(qml.SWAP(wires=[0, 1]).inv(), SWAP.conj().T),
(qml.CZ(wires=[0, 1]).inv(), CZ.conj().T),
]
def statepreparation(x):
# qml.BasisState(x, wires=[0, 1, 2, 3])
for i in range(len(x)):
qml.RY(np.pi * x[i] / 2, wires=i)
qml.RX(np.pi * x[i] / 2, wires=i)
qml.RZ(np.pi * x[i] / 2, wires=i)
"CRot": qml.CRot(0, 0, 0, wires=[0, 1]),
"CSWAP": qml.CSWAP(wires=[0, 1, 2]),
"CZ": qml.CZ(wires=[0, 1]),
"CY": qml.CY(wires=[0, 1]),
"DiagonalQubitUnitary": qml.DiagonalQubitUnitary(np.eye(2), wires=[0]),
"Hadamard": qml.Hadamard(wires=[0]),
"MultiRZ": qml.MultiRZ(0, wires=[0]),
"PauliX": qml.PauliX(wires=[0]),
"PauliY": qml.PauliY(wires=[0]),
"PauliZ": qml.PauliZ(wires=[0]),
"PhaseShift": qml.PhaseShift(0, wires=[0]),
"QubitStateVector": qml.QubitStateVector(np.array([1.0, 0.0]), wires=[0]),
"QubitUnitary": qml.QubitUnitary(np.eye(2), wires=[0]),
"RX": qml.RX(0, wires=[0]),
"RY": qml.RY(0, wires=[0]),
"RZ": qml.RZ(0, wires=[0]),
"Rot": qml.Rot(0, 0, 0, wires=[0]),
"S": qml.S(wires=[0]),
"SWAP": qml.SWAP(wires=[0, 1]),
"T": qml.T(wires=[0]),
"Toffoli": qml.Toffoli(wires=[0, 1, 2]),
}
all_ops = ops.keys()
# non-parametrized qubit gates
I = np.identity(2)
X = np.array([[0, 1], [1, 0]])
Y = np.array([[0, -1j], [1j, 0]])
Z = np.array([[1, 0], [0, -1]])
H = np.array([[1, 1], [1, -1]]) / sqrt(2)
def circuit(x, y, z):
qml.RX(x, wires=0)
qml.RY(y, wires=0)
qml.RZ(z, wires=0)
return qml.expval(qml.PauliZ(0))
def _decomposition_3_cnots(U, wires):
r"""The most general form of this decomposition is U = (A \otimes B) V (C \otimes D),
where V is as depicted in the circuit below:
-╭U- = -C--╭X--RZ(d)--╭C---------╭X--A-
-╰U- = -D--╰C--RY(b)--╰X--RY(a)--╰C--B-
"""
# First we add a SWAP as per v1 of arXiv:0308033, which helps with some
# rearranging of gates in the decomposition (it will cancel out the fact
# that we need to add a SWAP to fix the determinant in another part later).
swap_U = np.exp(1j * np.pi / 4) * math.dot(math.cast_like(SWAP, U), U)
# Choose the rotation angles of RZ, RY in the two-qubit decomposition.
# They are chosen as per Proposition V.1 in quant-ph/0308033 and are based
# on the phases of the eigenvalues of :math:`E^\dagger \gamma(U) E`, where
# \gamma(U) = (E^\dag U E) (E^\dag U E)^T.
# The rotation angles can be computed as follows (any three eigenvalues can be used)
u = math.dot(Edag, math.dot(swap_U, E))
gammaU = math.dot(u, math.T(u))
evs, _ = math.linalg.eig(gammaU)
# We will sort the angles so that results are consistent across interfaces.
angles = math.sort([math.angle(ev) for ev in evs])
x, y, z = angles[0], angles[1], angles[2]
# Compute functions of the eigenvalues; there are different options in v1
# vs. v3 of the paper, I'm not entirely sure why. This is the version from v3.
alpha = (x + y) / 2
beta = (x + z) / 2
delta = (z + y) / 2
# This is the interior portion of the decomposition circuit
interior_decomp = [
qml.CNOT(wires=[wires[1], wires[0]]),
qml.RZ(delta, wires=wires[0]),
qml.RY(beta, wires=wires[1]),
qml.CNOT(wires=wires),
qml.RY(alpha, wires=wires[1]),
qml.CNOT(wires=[wires[1], wires[0]]),
]
# We need the matrix representation of this interior part, V, in order to
# decompose U = (A \otimes B) V (C \otimes D)
#
# Looking at the decomposition above, V has determinant -1 (because there
# are 3 CNOTs, each with determinant -1). The relationship between U and V
# requires that both are in SU(4), so we add a SWAP after to V. We will see
# how this gets fixed later.
#
# -╭V- = -╭X--RZ(d)--╭C---------╭X--╭SWAP-
# -╰V- = -╰C--RY(b)--╰X--RY(a)--╰C--╰SWAP-
RZd = qml.RZ(math.cast_like(delta, 1j), wires=wires[0]).matrix
RYb = qml.RY(beta, wires=wires[0]).matrix
RYa = qml.RY(alpha, wires=wires[0]).matrix
V_mats = [
CNOT10,
math.kron(RZd, RYb), CNOT01,
math.kron(math.eye(2), RYa), CNOT10, SWAP
]
V = math.convert_like(math.eye(4), U)
for mat in V_mats:
V = math.dot(math.cast_like(mat, U), V)
# Now we need to find the four SU(2) operations A, B, C, D
A, B, C, D = _extract_su2su2_prefactors(swap_U, V)
# At this point, we have the following:
# -╭U-╭SWAP- = --C--╭X-RZ(d)-╭C-------╭X-╭SWAP--A
# -╰U-╰SWAP- = --D--╰C-RZ(b)-╰X-RY(a)-╰C-╰SWAP--B
#
# Using the relationship that SWAP(A \otimes B) SWAP = B \otimes A,
# -╭U-╭SWAP- = --C--╭X-RZ(d)-╭C-------╭X--B--╭SWAP-
# -╰U-╰SWAP- = --D--╰C-RZ(b)-╰X-RY(a)-╰C--A--╰SWAP-
#
# Now the SWAPs cancel, giving us the desired decomposition
# (up to a global phase).
# -╭U- = --C--╭X-RZ(d)-╭C-------╭X--B--
# -╰U- = --D--╰C-RZ(b)-╰X-RY(a)-╰C--A--
A_ops = zyz_decomposition(A, wires[1])
B_ops = zyz_decomposition(B, wires[0])
C_ops = zyz_decomposition(C, wires[0])
D_ops = zyz_decomposition(D, wires[1])
# Return the full decomposition
return C_ops + D_ops + interior_decomp + A_ops + B_ops
def circuit(phi, theta):
qml.RX(theta, wires=0)
qml.RZ(phi, wires=0)
return qml.expval(qml.PauliZ(0))