cirq_google.calibration.phased_fsim.PhaseCalibratedFSimGate

Association of a user gate with gate to calibrate.

cirq_google.calibration.phased_fsim.PhaseCalibratedFSimGate(
    engine_gate: cirq.FSimGate, phase_exponent: float
)

This association stores information regarding rotation of the calibrated FSim gate by phase_exponent p:

(Z^-p ⊗ Z^p) FSim (Z^p ⊗ Z^-p).

The unitary matrix of the gate is:

[[1, 0, 0, 0], [0, cos(θ), (1/g^2) sin(θ), 0], [0, (g^2) sin(θ), cos(θ), 0], [0, 0, 0, exp(-iφ)]]

where g = exp(i·π·p)

The rotation should be reflected back during the compilation after the gate is calibrated and is equivalent to the shift of -2πp in the χ angle of PhasedFSimGate.

engine_gate Gate that should be used for calibration purposes.
phase_exponent Phase rotation exponent p.

Methods

as_characterized_phased_fsim_gate

View source

as_characterized_phased_fsim_gate(
    parameters: cirq_google.calibration.PhasedFSimCharacterization
) -> cirq.PhasedFSimGate

Creates a PhasedFSimGate which represents the characterized engine_gate but includes deviations in unitary parameters.

Args
parameters The results of characterization of the engine gate.

Returns
Instance of PhasedFSimGate that executes a gate according to the characterized parameters of the engine_gate.

with_zeta_chi_gamma_compensated

View source

with_zeta_chi_gamma_compensated(
    qubits: Tuple[cirq.Qid, cirq.Qid],
    parameters: cirq_google.calibration.PhasedFSimCharacterization,
    *,
    engine_gate: Optional[cirq.Gate] = None
) -> Tuple[Tuple[cirq.Operation, ...], ...]

Creates a composite operation that compensates for zeta, chi and gamma angles of the characterization.

Args
qubits Qubits that the gate should act on.
parameters The results of characterization of the engine gate.
engine_gate 2-qubit gate that represents the engine gate. When None, the internal engine_gate of this instance is used. This argument is useful for testing purposes.

Returns
Tuple of tuple of operations that describe the compensated gate. The first index iterates over moments of the composed operation.

Raises
ValueError If the engine gate is not a 2-qubit gate.

__eq__

__eq__(
    other
)