LinearPauliRotations¶

class LinearPauliRotations(num_state_qubits=None, slope=1, offset=0, basis='Y', name='LinRot')[Quellcode]

Linearly-controlled X, Y or Z rotation.

For a register of state qubits $$|x\rangle$$, a target qubit $$|0\rangle$$ and the basis 'Y' this circuit acts as:

    q_0: ─────────────────────────■───────── ... ──────────────────────
│
.
│
q_(n-1): ─────────────────────────┼───────── ... ───────────■──────────
┌────────────┐  ┌───────┴───────┐       ┌─────────┴─────────┐
q_n: ─┤ RY(offset) ├──┤ RY(2^0 slope) ├  ...  ┤ RY(2^(n-1) slope) ├
└────────────┘  └───────────────┘       └───────────────────┘


This can for example be used to approximate linear functions, with $$a/2 =$$ slope and $$b/2 =$$ offset and the basis 'Y':

$|x\rangle |0\rangle \mapsto \cos(ax + b)|x\rangle|0\rangle + \sin(ax + b)|x\rangle |1\rangle$

Since for small arguments $$\sin(x) \approx x$$ this operator can be used to approximate linear functions.

Create a new linear rotation circuit.

Parameter
• num_state_qubits (Optional[int]) – The number of qubits representing the state $$|x\rangle$$.

• slope (float) – The slope of the controlled rotation.

• offset (float) – The offset of the controlled rotation.

• basis (str) – The type of Pauli rotation (‚X‘, ‚Y‘, ‚Z‘).

• name (str) – The name of the circuit object.

Attributes

ancillas

Returns a list of ancilla bits in the order that the registers were added.

Rückgabetyp

List[AncillaQubit]

basis

The kind of Pauli rotation to be used.

Set the basis to ‚X‘, ‚Y‘ or ‚Z‘ for controlled-X, -Y, or -Z rotations respectively.

Rückgabetyp

str

Rückgabe

The kind of Pauli rotation used in controlled rotation.

calibrations

Return calibration dictionary.

The custom pulse definition of a given gate is of the form

{‚gate_name‘: {(qubits, params): schedule}}

Rückgabetyp

dict

clbits

Returns a list of classical bits in the order that the registers were added.

Rückgabetyp

List[Clbit]

data
extension_lib = 'include "qelib1.inc";'
global_phase

Return the global phase of the circuit in radians.

Rückgabetyp

Union[ParameterExpression, float]

header = 'OPENQASM 2.0;'
instances = 87

The user provided metadata associated with the circuit

The metadata for the circuit is a user provided dict of metadata for the circuit. It will not be used to influence the execution or operation of the circuit, but it is expected to be passed between all transforms of the circuit (ie transpilation) and that providers will associate any circuit metadata with the results it returns from execution of that circuit.

Rückgabetyp

dict

num_ancilla_qubits

The minimum number of ancilla qubits in the circuit.

Rückgabetyp

int

Rückgabe

The minimal number of ancillas required.

num_ancillas

Return the number of ancilla qubits.

Rückgabetyp

int

num_clbits

Return number of classical bits.

Rückgabetyp

int

num_parameters
Rückgabetyp

int

num_qubits

Return number of qubits.

Rückgabetyp

int

num_state_qubits

The number of state qubits representing the state $$|x\rangle$$.

Rückgabetyp

int

Rückgabe

The number of state qubits.

offset

The angle of the single qubit offset rotation on the target qubit.

Before applying the controlled rotations, a single rotation of angle offset is applied to the target qubit.

Rückgabetyp

float

Rückgabe

The offset angle.

op_start_times

Return a list of operation start times.

This attribute is enabled once one of scheduling analysis passes runs on the quantum circuit.

Rückgabetyp

List[int]

Rückgabe

List of integers representing instruction start times. The index corresponds to the index of instruction in QuantumCircuit.data.

Verursacht

AttributeError – When circuit is not scheduled.

parameters
Rückgabetyp

ParameterView

prefix = 'circuit'
qregs

A list of the quantum registers associated with the circuit.

qubits

Returns a list of quantum bits in the order that the registers were added.

Rückgabetyp

List[Qubit]

slope

The multiplicative factor in the rotation angle of the controlled rotations.

The rotation angles are slope * 2^0, slope * 2^1, … , slope * 2^(n-1) where n is the number of state qubits.

Rückgabetyp

float

Rückgabe

The rotation angle common in all controlled rotations.