cirq.testing.ValidatingTestDevice

A fake device that was created to ensure certain Device validation features are

Inherits From: Device

cirq.testing.ValidatingTestDevice(
    qubits: AbstractSet[cirq.ops.Qid],
    name: str = 'ValidatingTestDevice',
    allowed_gates: Tuple[type, ...] = (ops.Gate,),
    allowed_qubit_types: Tuple[type, ...] = (devices.GridQubit,),
    validate_locality: bool = False,
    auto_decompose_gates: Tuple[type, ...] = tuple()
)

leveraged in Circuit functions. It contains the minimum set of features that tests require. Feel free to extend the features here as needed.

qubits set of qubits on this device
name the name for repr
allowed_gates tuple of allowed gate types
allowed_qubit_types tuple of allowed qubit types
validate_locality if True, device will validate 2 qubit operations (except MeasurementGateOperations) whether the two qubits are adjacent. If True, GridQubits are assumed to be part of the allowed_qubit_types
auto_decompose_gates when set, for given gates it calls the cirq.decompose protocol

Methods

can_add_operation_into_moment

View source

can_add_operation_into_moment(
    operation: "cirq.Operation",
    moment: "cirq.Moment"
) -> bool

Determines if it's possible to add an operation into a moment.

For example, on the XmonDevice two CZs shouldn't be placed in the same moment if they are on adjacent qubits.

Args
operation The operation being added.
moment The moment being transformed.

Returns
Whether or not the moment will validate after adding the operation.

decompose_operation

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decompose_operation(
    operation: "ops.Operation"
) -> "ops.OP_TREE"

Returns a device-valid decomposition for the given operation.

This method is used when adding operations into circuits with a device specified, to avoid spurious failures due to e.g. using a Hadamard gate that must be decomposed into native gates.

qid_pairs

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qid_pairs() -> Optional[FrozenSet['cirq.SymmetricalQidPair']]

Returns a set of qubit edges on the device, if possible.

This property can be overridden in child classes for special handling. The default handling is: GridQids and LineQids will have neighbors as edges, and others will be fully connected.

Returns
If the device has a finite set of qubits, then a set of all edges on the device is returned.

If the device has no well defined finite set of qubits (e.g. cirq.UnconstrainedDevice has this property), then None is returned.

qubit_set

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qubit_set() -> Optional[AbstractSet['cirq.Qid']]

Returns a set or frozenset of qubits on the device, if possible.

Returns
If the device has a finite set of qubits, then a set or frozen set of all qubits on the device is returned.

If the device has no well defined finite set of qubits (e.g. cirq.UnconstrainedDevice has this property), then None is returned.

validate_circuit

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validate_circuit(
    circuit: "cirq.Circuit"
) -> None

Raises an exception if a circuit is not valid.

Args
circuit The circuit to validate.

Raises
ValueError The circuit isn't valid for this device.

validate_moment

View source

validate_moment(
    moment: "cirq.Moment"
) -> None

Raises an exception if a moment is not valid.

Args
moment The moment to validate.

Raises
ValueError The moment isn't valid for this device.

validate_operation

View source

validate_operation(
    operation: cirq.ops.Operation
) -> None

Raises an exception if an operation is not valid.

Args
operation The operation to validate.

Raises
ValueError The operation isn't valid for this device.