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cirq.contrib.graph_device.UndirectedGraphDevice

A device whose properties are represented by an edge-labelled graph.

Inherits From: Device

Each (undirected) edge of the device graph is labelled by an UndirectedGraphDeviceEdge or None. None indicates that any operation is allowed and has zero duration.

Each (undirected) edge of the constraint graph is labelled either by a function or None. The function takes as arguments operations on the adjacent device edges and raises an error if they are not simultaneously executable. If None, no such operations are allowed.

Note that

* the crosstalk graph is allowed to have vertices (i.e. device edges)
    that do not exist in the graph device.
* duration_of does not check that operation is valid.

device_graph An undirected hypergraph whose vertices correspond to qubits and whose edges determine allowable operations and their durations.
crosstalk_graph An undirected hypergraph whose vertices are edges of device_graph and whose edges give simultaneity constraints thereon.

TypeError If the crosstalk graph is not a valid crosstalk graph.

edges

labelled_edges

metadata Returns the associated Metadata with the device if applicable.
qubits

Methods

can_add_operation_into_moment

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THIS FUNCTION IS DEPRECATED.

IT WILL BE REMOVED IN cirq v0.15.

can_add_operation_into_moment will be removed in the future. Consider using device.validate_circuit instead.

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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THIS FUNCTION IS DEPRECATED.

IT WILL BE REMOVED IN cirq v0.15.

Devices will no longer decompose operations.

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.

duration_of

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get_device_edge_from_op

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qid_pairs

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THIS FUNCTION IS DEPRECATED.

IT WILL BE REMOVED IN cirq v0.15.

qubit coupling data can now be found in device.metadata.nx_graph if provided.

qubit_set

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THIS FUNCTION IS DEPRECATED.

IT WILL BE REMOVED IN cirq v0.15.

Please use UndirectedGraphDevice.qubits

validate_circuit

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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_crosstalk

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validate_moment

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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

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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.

__add__

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__eq__

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Return self==value.