cirq.google.PhasedFSimCharacterization

Holder for the unitary angles of the cirq.PhasedFSimGate.

Used in the notebooks

Used in the tutorials

This class stores five unitary parameters (θ, ζ, χ, γ and φ) that describe the cirq.PhasedFSimGate which is the most general particle conserving two-qubit gate. The unitary of the underlying gate is:

[[1,                        0,                       0,                0],
 [0,    exp(-i(γ + ζ)) cos(θ), -i exp(-i(γ - χ)) sin(θ),               0],
 [0, -i exp(-i(γ + χ)) sin(θ),    exp(-i(γ - ζ)) cos(θ),               0],
 [0,                        0,                       0,  exp(-i(2γ + φ))]]

The parameters θ, γ and φ are symmetric and parameters ζ and χ asymmetric under the qubits exchange.

All the angles described by this class are optional and can be left unknown. This is relevant for characterization routines that characterize only subset of the gate parameters. All the angles are assumed to take a fixed numerical values which reflect the current state of the characterized gate.

This class supports JSON serialization and deserialization.

theta θ angle in radians or None when unknown.
zeta ζ angle in radians or None when unknown.
chi χ angle in radians or None when unknown.
gamma γ angle in radians or None when unknown.
phi φ angle in radians or None when unknown.

Methods

all_none

View source

Returns True if all the angles are None

any_none

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Returns True if any the angle is None

asdict

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Converts parameters to a dictionary that maps angle names to values.

merge_with

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Substitutes missing parameter with values from other.

Args
other Parameters to use for None values.

Returns
New instance of PhasedFSimCharacterization with values from this instance if they are set or values from other when some parameter is None.

override_by

View source

Overrides other parameters that are not None.

Args
other Parameters to use for override.

Returns
New instance of PhasedFSimCharacterization with values from other if set (values from other that are not None). Otherwise the current values are used.

parameters_for_qubits_swapped

View source

Parameters for the gate with qubits swapped between each other.

The angles theta, gamma and phi are kept unchanged. The angles zeta and chi are negated for the gate with swapped qubits.

Returns
New instance with angles adjusted for swapped qubits.

__eq__

chi None
gamma None
phi None
theta None
zeta None