cirq_google.experimental.PerQubitDepolarizingWithDampedReadoutNoiseModel

NoiseModel with T1 decay on gates and damping/bitflip on measurement.

cirq_google.experimental.PerQubitDepolarizingWithDampedReadoutNoiseModel(
    depol_probs: Optional[Dict[cirq.Qid, float]] = None,
    bitflip_probs: Optional[Dict[cirq.Qid, float]] = None,
    decay_probs: Optional[Dict[cirq.Qid, float]] = None
)

With this model, T1 decay is added after all non-measurement gates, then amplitude damping followed by bitflip error is added before all measurement gates. Idle qubits are unaffected by this model.

As with the DepolarizingWithDampedReadoutNoiseModel, this model does not allow a moment to contain both measurement and non-measurement gates.

depol_probs Dict of depolarizing probabilities for each qubit.
bitflip_probs Dict of bit-flip probabilities during measurement.
decay_probs Dict of T1 decay probabilities during measurement. Bitflip noise is applied first, then amplitude decay.

Methods

from_noise_model_like

@classmethod
from_noise_model_like(
    noise: 'cirq.NOISE_MODEL_LIKE'
) -> 'cirq.NoiseModel'

Transforms an object into a noise model if unambiguously possible.

Args
noise None, a cirq.NoiseModel, or a single qubit operation.

Returns
cirq.NO_NOISE when given None, cirq.ConstantQubitNoiseModel(gate) when given a single qubit gate, or the given value if it is already a cirq.NoiseModel.

Raises
ValueError If noise is a cirq.Gate that acts on more than one qubit.
TypeError The input is not a cirq.NOISE_MODE_LIKE.

is_virtual_moment

is_virtual_moment(
    moment: 'cirq.Moment'
) -> bool

Returns true iff the given moment is non-empty and all of its operations are virtual.

Moments for which this method returns True should not have additional noise applied to them.

Args
moment cirq.Moment to check for non-virtual operations.

Returns
True if "moment" is non-empty and all operations in "moment" are virtual; false otherwise.

noisy_moment

View source

noisy_moment(
    moment: cirq.Moment, system_qubits: Sequence[cirq.Qid]
) -> cirq.OP_TREE

Adds noise to the operations from a moment.

Args
moment The moment to add noise to.
system_qubits A list of all qubits in the system.

Returns
An OP_TREE corresponding to the noisy operations for the moment.

noisy_moments

noisy_moments(
    moments: Iterable['cirq.Moment'], system_qubits: Sequence['cirq.Qid']
) -> Sequence['cirq.OP_TREE']

Adds possibly stateful noise to a series of moments.

Args
moments The moments to add noise to.
system_qubits A list of all qubits in the system.

Returns
A sequence of OP_TREEs, with the k'th tree corresponding to the noisy operations for the k'th moment.

noisy_operation

noisy_operation(
    operation: 'cirq.Operation'
) -> 'cirq.OP_TREE'

Adds noise to an individual operation.

Args
operation The operation to make noisy.

Returns
An OP_TREE corresponding to the noisy operations implementing the noisy version of the given operation.