def sample_gate(a: cirq.Qid, b: cirq.Qid,
gate: cirq.FSimGate) -> PhasedFSimCharacterization:
assert isinstance(gate,
cirq.FSimGate), f'Expected FSimGate, got {gate}'
assert np.isclose(gate.theta, np.pi / 4) and np.isclose(
gate.phi, 0.0), f'Expected ISWAP ** -0.5 like gate, got {gate}'
if (a, b) in parameters:
pair_parameters = parameters[(a, b)]
if not isinstance(pair_parameters, PhasedFSimCharacterization):
pair_parameters = PhasedFSimCharacterization(
**pair_parameters)
elif (b, a) in parameters:
pair_parameters = parameters[(b, a)]
if not isinstance(pair_parameters, PhasedFSimCharacterization):
pair_parameters = PhasedFSimCharacterization(
**pair_parameters)
pair_parameters = pair_parameters.parameters_for_qubits_swapped(
)
elif ideal_when_missing_gate:
pair_parameters = SQRT_ISWAP_INV_PARAMETERS
else:
raise ValueError(f'Missing parameters for pair {(a, b)}')
if pair_parameters.any_none():
if not ideal_when_missing_parameter:
raise ValueError(
f'Missing parameter value for pair {(a, b)}, '
f'parameters={pair_parameters}')
pair_parameters = pair_parameters.merge_with(
SQRT_ISWAP_INV_PARAMETERS)
return pair_parameters
def sample_gate(a: cirq.Qid, b: cirq.Qid,
gate: cirq.FSimGate) -> PhasedFSimCharacterization:
_assert_inv_sqrt_iswap_like(gate)
if (a, b) in parameters:
pair_parameters = parameters[(a, b)]
if not isinstance(pair_parameters, PhasedFSimCharacterization):
pair_parameters = PhasedFSimCharacterization(
**pair_parameters)
elif (b, a) in parameters:
pair_parameters = parameters[(b, a)]
if not isinstance(pair_parameters, PhasedFSimCharacterization):
pair_parameters = PhasedFSimCharacterization(
**pair_parameters)
pair_parameters = pair_parameters.parameters_for_qubits_swapped(
)
elif ideal_when_missing_gate:
pair_parameters = SQRT_ISWAP_INV_PARAMETERS
else:
raise ValueError(f'Missing parameters for pair {(a, b)}')
if pair_parameters.any_none():
if not ideal_when_missing_parameter:
raise ValueError(
f'Missing parameter value for pair {(a, b)}, '
f'parameters={pair_parameters}')
pair_parameters = pair_parameters.merge_with(
SQRT_ISWAP_INV_PARAMETERS)
return pair_parameters
def test_merge_with():
characterization = PhasedFSimCharacterization(theta=0.1, zeta=0.2, chi=0.3)
other = PhasedFSimCharacterization(gamma=0.4, phi=0.5, theta=0.6)
assert characterization.merge_with(other) == PhasedFSimCharacterization(
theta=0.1, zeta=0.2, chi=0.3, gamma=0.4, phi=0.5)
