qiskit.transpiler.passes.RZXCalibrationBuilder

class RZXCalibrationBuilder(backend)

Creates calibrations for RZXGate(theta) by stretching and compressing Gaussian square pulses in the CX gate. This is done by retrieving (for a given pair of qubits) the CX schedule in the instruction schedule map of the backend defaults. The CX schedule must be an echoed cross-resonance gate optionally with rotary tones. The cross-resonance drive tones and rotary pulses must be Gaussian square pulses. The width of the Gaussian square pulse is adjusted so as to match the desired rotation angle. If the rotation angle is small such that the width disappears then the amplitude of the zero width Gaussian square pulse (i.e. a Gaussian) is reduced to reach the target rotation angle. Additional details can be found in https://arxiv.org/abs/2012.11660.

Initializes a RZXGate calibration builder.

Parameter

backend (<module 'qiskit.providers.basebackend' from '/home/computertreker/git/qiskit/qiskit-translations/build_docs/lib/python3.7/site-packages/qiskit/providers/basebackend.py'>) – Backend for which to construct the gates.

Verursacht

QiskitError – if open pulse is not supported by the backend.

__init__(backend)

Initializes a RZXGate calibration builder.

Parameter

backend (<module 'qiskit.providers.basebackend' from '/home/computertreker/git/qiskit/qiskit-translations/build_docs/lib/python3.7/site-packages/qiskit/providers/basebackend.py'>) – Backend for which to construct the gates.

Verursacht

QiskitError – if open pulse is not supported by the backend.

Methods

__init__(backend)	Initializes a RZXGate calibration builder.
get_calibration(params, qubits)	type params List
name()	Return the name of the pass.
rescale_cr_inst(instruction, theta[, …])	type instruction Play
run(dag)	Run the calibration adder pass on dag.
supported(node_op)	type node_op DAGNode

Attributes

is_analysis_pass	Check if the pass is an analysis pass.
is_transformation_pass	Check if the pass is a transformation pass.

get_calibration(params, qubits)

Parameter

• params (List) – Parameters of the RZXGate(theta). I.e. params[0] is theta.

• qubits (List) – List of qubits for which to get the schedules. The first qubit is the control and the second is the target.

Rückgabe

The calibration schedule for the RZXGate(theta).

Rückgabetyp

schedule

Verursacht

QiskitError – if the control and target qubits cannot be identified or the backend does not support cx between the qubits.

property is_analysis_pass

Check if the pass is an analysis pass.

If the pass is an AnalysisPass, that means that the pass can analyze the DAG and write the results of that analysis in the property set. Modifications on the DAG are not allowed by this kind of pass.

property is_transformation_pass

Check if the pass is a transformation pass.

If the pass is a TransformationPass, that means that the pass can manipulate the DAG, but cannot modify the property set (but it can be read).

name()

Return the name of the pass.

static rescale_cr_inst(instruction, theta, sample_mult=16)

Parameter

• instruction (Play) – The instruction from which to create a new shortened or lengthened pulse.

• theta (float) – desired angle, pi/2 is assumed to be the angle that the pulse in the given play instruction implements.

• sample_mult (int) – All pulses must be a multiple of sample_mult.

Rückgabe

The play instruction with the stretched compressed

GaussianSquare pulse.

Rückgabetyp

qiskit.pulse.Play

Verursacht

QiskitError – if the pulses are not GaussianSquare.

run(dag)

Run the calibration adder pass on dag.

Parameter

dag (DAGCircuit) – DAG to schedule.

Rückgabe

A DAG with calibrations added to it.

Rückgabetyp

DAGCircuit

supported(node_op)

Parameter

node_op (DAGNode) – The node from the dag dep.

Rückgabe

True if the node is a RZXGate.

Rückgabetyp

match