cirq.contrib.acquaintance.ShiftSwapNetworkGate

A swap network that generalizes the circular shift gate.

Inherits From: PermutationGate, Gate

Given a specification of two partitions, implements a swap network that has the overall effect of:

* For every pair of parts, one from each partition, acquainting the
    union of the corresponding qubits.
* Circularly shifting the two sets of qubits.

left_part_lens The sizes of the parts in the partition of the first set of qubits.
right_part_lens The sizes of the parts in the partition of the second set of qubits.
swap_gate The gate to use when decomposing.

part_lens A mapping from the side (as a str, 'left' or 'right') to the part sizes of the corresponding partition.
swap_gate The gate to use when decomposing.

Methods

acquaintance_size

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controlled

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Returns a controlled version of this gate. If no arguments are specified, defaults to a single qubit control.

num_controls: Total number of control qubits. control_values: For which control qubit values to apply the sub gate. A sequence of length num_controls where each entry is an integer (or set of integers) corresponding to the qubit value (or set of possible values) where that control is enabled. When all controls are enabled, the sub gate is applied. If unspecified, control values default to 1. control_qid_shape: The qid shape of the controls. A tuple of the expected dimension of each control qid. Defaults to (2,) * num_controls. Specify this argument when using qudits.

num_qubits

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The number of qubits this gate acts on.

on

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Returns an application of this gate to the given qubits.

Args
*qubits The collection of qubits to potentially apply the gate to.

permutation

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permutation = {i: s[i]} indicates that the i-th element is mapped to the s[i]-th element.

qubit_count

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update_mapping

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Updates a mapping (in place) from qubits to logical indices.

Args
mapping The mapping to update.
keys The qubits acted on by the gate.

validate_args

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Checks if this gate can be applied to the given qubits.

By default checks that:

  • inputs are of type Qid
  • len(qubits) == num_qubits()
  • qubit_i.dimension == qid_shape[i] for all qubits

Child classes can override. The child implementation should call super().validate_args(qubits) then do custom checks.

Args
qubits The sequence of qubits to potentially apply the gate to.

Throws:

  • ValueError: The gate can't be applied to the qubits.

validate_permutation

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with_probability

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wrap_in_linear_combination

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__add__

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__call__

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Call self as a function.

__eq__

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Return self==value.

__mul__

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__neg__

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__pow__

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__rmul__

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__sub__

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__truediv__

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