def test_benchmark_2q_xeb_fidelities():
q0, q1 = cirq.LineQubit.range(2)
circuits = [
rqcg.random_rotations_between_two_qubit_circuit(
q0,
q1,
depth=50,
two_qubit_op_factory=lambda a, b, _: SQRT_ISWAP(a, b),
seed=52) for _ in range(2)
]
cycle_depths = np.arange(3, 50, 9)
sampled_df = sample_2q_xeb_circuits(sampler=cirq.Simulator(seed=53),
circuits=circuits,
cycle_depths=cycle_depths)
fid_df = benchmark_2q_xeb_fidelities(sampled_df, circuits, cycle_depths)
assert len(fid_df) == len(cycle_depths)
for _, row in fid_df.iterrows():
assert row['cycle_depth'] in cycle_depths
assert row['fidelity'] > 0.98
fit_df = fit_exponential_decays(fid_df)
for _, row in fit_df.iterrows():
assert list(row['cycle_depths']) == list(cycle_depths)
assert len(row['fidelities']) == len(cycle_depths)
def test_parameterize_phased_fsim_circuit():
q0, q1 = cirq.LineQubit.range(2)
circuit = rqcg.random_rotations_between_two_qubit_circuit(
q0, q1, depth=3, two_qubit_op_factory=lambda a, b, _: SQRT_ISWAP(a, b), seed=52
)
p_circuit = parameterize_phased_fsim_circuit(circuit, SqrtISwapXEBOptions())
cirq.testing.assert_has_diagram(
p_circuit,
"""\
0 1
│ │
Y^0.5 X^0.5
│ │
PhFSim(theta, zeta, chi, gamma, phi)─PhFSim(theta, zeta, chi, gamma, phi)
│ │
PhX(0.25)^0.5 Y^0.5
│ │
PhFSim(theta, zeta, chi, gamma, phi)─PhFSim(theta, zeta, chi, gamma, phi)
│ │
Y^0.5 X^0.5
│ │
PhFSim(theta, zeta, chi, gamma, phi)─PhFSim(theta, zeta, chi, gamma, phi)
│ │
X^0.5 PhX(0.25)^0.5
│ │
""",
transpose=True,
)
def circuits_cycle_depths_sampled_df():
q0, q1 = cirq.LineQubit.range(2)
circuits = [
rqcg.random_rotations_between_two_qubit_circuit(
q0, q1, depth=50, two_qubit_op_factory=lambda a, b, _: SQRT_ISWAP(a, b), seed=52
)
for _ in range(2)
]
cycle_depths = np.arange(10, 40 + 1, 10)
sampled_df = sample_2q_xeb_circuits(
sampler=cirq.Simulator(seed=53), circuits=circuits, cycle_depths=cycle_depths
)
return circuits, cycle_depths, sampled_df
def test_characterize_phased_fsim_parameters_with_xeb():
q0, q1 = cirq.LineQubit.range(2)
rs = np.random.RandomState(52)
circuits = [
rqcg.random_rotations_between_two_qubit_circuit(
q0,
q1,
depth=20,
two_qubit_op_factory=lambda a, b, _: SQRT_ISWAP(a, b),
seed=rs,
) for _ in range(2)
]
cycle_depths = np.arange(3, 20, 6)
sampled_df = sample_2q_xeb_circuits(
sampler=cirq.Simulator(seed=rs),
circuits=circuits,
cycle_depths=cycle_depths,
progress_bar=None,
)
# only optimize theta so it goes faster.
options = SqrtISwapXEBOptions(
characterize_theta=True,
characterize_gamma=False,
characterize_chi=False,
characterize_zeta=False,
characterize_phi=False,
)
p_circuits = [
parameterize_circuit(circuit, options) for circuit in circuits
]
with multiprocessing.Pool() as pool:
result = characterize_phased_fsim_parameters_with_xeb(
sampled_df=sampled_df,
parameterized_circuits=p_circuits,
cycle_depths=cycle_depths,
options=options,
# speed up with looser tolerances:
fatol=1e-2,
xatol=1e-2,
pool=pool,
)
opt_res = result.optimization_results[(q0, q1)]
assert np.abs(opt_res.x[0] + np.pi / 4) < 0.1
assert np.abs(opt_res.fun) < 0.1 # noiseless simulator
assert len(result.fidelities_df) == len(cycle_depths)
assert np.all(result.fidelities_df['fidelity'] > 0.95)