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UnitaryGate

class UnitaryGate(data, label=None)

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Class for representing unitary gates

Create a gate from a numeric unitary matrix.

Parameters

  • data (matrix or Operator) – unitary operator.
  • label (str) – unitary name for backend [Default: None].

Raises

ExtensionError – if input data is not an N-qubit unitary operator.


Attributes

decompositions

Get the decompositions of the instruction from the SessionEquivalenceLibrary.

definition

Return definition in terms of other basic gates.

label

Type: str

Return gate label

Return type

str

params

return instruction params.


Methods

add_decomposition

UnitaryGate.add_decomposition(decomposition)

Add a decomposition of the instruction to the SessionEquivalenceLibrary.

adjoint

UnitaryGate.adjoint()

Return the adjoint of the unitary.

assemble

UnitaryGate.assemble()

Assemble a QasmQobjInstruction

Return type

Instruction

broadcast_arguments

UnitaryGate.broadcast_arguments(qargs, cargs)

Validation and handling of the arguments and its relationship.

For example, cx([q[0],q[1]], q[2]) means cx(q[0], q[2]); cx(q[1], q[2]). This method yields the arguments in the right grouping. In the given example:

in: [[q[0],q[1]], q[2]],[]
outs: [q[0], q[2]], []
      [q[1], q[2]], []

The general broadcasting rules are:

  • If len(qargs) == 1:

    [q[0], q[1]] -> [q[0]],[q[1]]
  • If len(qargs) == 2:

    [[q[0], q[1]], [r[0], r[1]]] -> [q[0], r[0]], [q[1], r[1]]
    [[q[0]], [r[0], r[1]]]       -> [q[0], r[0]], [q[0], r[1]]
    [[q[0], q[1]], [r[0]]]       -> [q[0], r[0]], [q[1], r[0]]
  • If len(qargs) >= 3:

    [q[0], q[1]], [r[0], r[1]],  ...] -> [q[0], r[0], ...], [q[1], r[1], ...]

Parameters

  • qargs (List) – List of quantum bit arguments.
  • cargs (List) – List of classical bit arguments.

Return type

Tuple[List, List]

Returns

A tuple with single arguments.

Raises

CircuitError – If the input is not valid. For example, the number of arguments does not match the gate expectation.

c_if

UnitaryGate.c_if(classical, val)

Add classical condition on register classical and value val.

conjugate

UnitaryGate.conjugate()

Return the conjugate of the unitary.

control

UnitaryGate.control(num_ctrl_qubits=1, label=None, ctrl_state=None)

Return controlled version of gate

Parameters

  • num_ctrl_qubits (int) – number of controls to add to gate (default=1)
  • label (str) – optional gate label
  • ctrl_state (int or str or None) – The control state in decimal or as a bit string (e.g. ‘1011’). If None, use 2**num_ctrl_qubits-1.

Returns

controlled version of gate.

Return type

UnitaryGate

Raises

QiskitError – invalid ctrl_state

copy

UnitaryGate.copy(name=None)

Copy of the instruction.

Parameters

name (str) – name to be given to the copied circuit, if None then the name stays the same.

Returns

a copy of the current instruction, with the name

updated if it was provided

Return type

qiskit.circuit.Instruction

inverse

UnitaryGate.inverse()

Return the adjoint of the unitary.

is_parameterized

UnitaryGate.is_parameterized()

Return True .IFF. instruction is parameterized else False

mirror

UnitaryGate.mirror()

For a composite instruction, reverse the order of sub-gates.

This is done by recursively mirroring all sub-instructions. It does not invert any gate.

Returns

a fresh gate with sub-gates reversed

Return type

qiskit.circuit.Instruction

power

UnitaryGate.power(exponent)

Creates a unitary gate as gate^exponent.

Parameters

exponent (float) – Gate^exponent

Returns

To which to_matrix is self.to_matrix^exponent.

Return type

qiskit.extensions.UnitaryGate

Raises

CircuitError – If Gate is not unitary

qasm

UnitaryGate.qasm()

The qasm for a custom unitary gate This is achieved by adding a custom gate that corresponds to the definition of this gate. It gives the gate a random name if one hasn’t been given to it.

repeat

UnitaryGate.repeat(n)

Creates an instruction with gate repeated n amount of times.

Parameters

n (int) – Number of times to repeat the instruction

Returns

Containing the definition.

Return type

qiskit.circuit.Instruction

Raises

CircuitError – If n < 1.

to_matrix

UnitaryGate.to_matrix()

Return matrix for the unitary.

transpose

UnitaryGate.transpose()

Return the transpose of the unitary.

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