cirq_google.devices.GoogleNoiseProperties

Noise-defining properties for a Google device.

cirq_google.devices.GoogleNoiseProperties(
    gate_times_ns: Dict[type, float],
    t1_ns: Dict['cirq.Qid', float],
    tphi_ns: Dict['cirq.Qid', float],
    readout_errors: Dict['cirq.Qid', List[float]],
    gate_pauli_errors: Dict[noise_utils.OpIdentifier, float],
    validate: bool = True,
    fsim_errors: Dict[noise_utils.OpIdentifier, cirq.PhasedFSimGate] = dataclasses.field(default_factory=dict)
)

gate_times_ns Dict[Type[cirq.Gate], float] of gate types to their duration on quantum hardware. Used with t(1|phi)_ns to specify thermal noise.
t1_ns Dict[cirq.Qid, float] of qubits to their T_1 time, in ns.
tphi_ns Dict[cirq.Qid, float] of qubits to their T_phi time, in ns.
readout_errors Dict[cirq.Qid, np.ndarray] of qubits to their readout errors in matrix form: [P(read |1> from |0>), P(read |0> from |1>)]. Used to prepend amplitude damping errors to measurements.
gate_pauli_errors dict of noise_utils.OpIdentifiers (a gate and the qubits it targets) to the Pauli error for that operation. Used to construct depolarizing error. Keys in this dict must have defined qubits.
validate If True, verifies that t1 and tphi qubits sets match, and that all symmetric two-qubit gates have errors which are symmetric over the qubits they affect. Defaults to True.

fsim_errors Dict[noise_utils.OpIdentifier, cirq.PhasedFSimGate] of gate types (potentially on specific qubits) to the PhasedFSim fix-up operation for that gate. Defaults to no-op for all gates.

qubits Qubits for which we have data
gate_times_ns Dataclass field
t1_ns Dataclass field
tphi_ns Dataclass field
readout_errors Dataclass field
gate_pauli_errors Dataclass field
validate Dataclass field
fsim_errors Dataclass field

Methods

asymmetric_two_qubit_gates

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@classmethod
asymmetric_two_qubit_gates() -> Set[type]

Returns the set of asymmetric two-qubit gates this class supports.

build_noise_models

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build_noise_models() -> List['cirq.NoiseModel']

Construct all NoiseModels associated with NoiseProperties.

expected_gates

@classmethod
expected_gates() -> Set[Type[ops.Gate]]

Returns the set of all gates this class supports.

single_qubit_gates

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@classmethod
single_qubit_gates() -> Set[type]

Returns the set of single-qubit gates this class supports.

symmetric_two_qubit_gates

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@classmethod
symmetric_two_qubit_gates() -> Set[type]

Returns the set of symmetric two-qubit gates this class supports.

two_qubit_gates

@classmethod
two_qubit_gates() -> Set[Type[ops.Gate]]

Returns the set of all two-qubit gates this class supports.

with_params

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with_params(
    *,
    gate_times_ns: Union[None, float, Dict[Type['cirq.Gate'], float]] = None,
    t1_ns: Union[None, float, Dict['cirq.Qid', float]] = None,
    tphi_ns: Union[None, float, Dict['cirq.Qid', float]] = None,
    readout_errors: Union[None, Sequence[float], Dict['cirq.Qid', Sequence[float]]] = None,
    gate_pauli_errors: Union[None, float, Dict[Union[Type['cirq.Gate'], noise_utils.OpIdentifier],
        float]] = None,
    fsim_errors: Union[None, 'cirq.PhasedFSimGate', Dict[Union[Type['cirq.Gate'],
        noise_utils.OpIdentifier], 'cirq.PhasedFSimGate']] = None
)

Returns a copy of this object with the given params overridden.

This method supports partial replacement: each arg can accept a single value (which will replace all existing values) or a mapping (which will replace matching entries in the old object). Otherwise, all fields are the same as those used in the constructor.

Args

gate_times_ns: float or Dict[Type[cirq.Gate], float]. t1_ns: float or Dict[cirq.Qid, float]. tphi_ns: float or Dict[cirq.Qid, float]. readout_errors: Sequence or Dict[cirq.Qid, Sequence]. Converted to np.ndarray if not provided in that format. gate_pauli_errors: float or Dict[cirq.OpIdentifier, float]. Dict key can also be Type[cirq.Gate]; this will apply the given error to all placements of that gate that appear in the original object. fsim_errors: cirq.PhasedFSimGate or Dict[cirq.OpIdentifier, cirq.PhasedFSimGate] Dict key can also be Type[cirq.Gate]; this will apply the given error to all placements of that gate that appear in the original object.

__eq__

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__eq__(
    other
)

Return self==value.

validate True