qiskit.transpiler.passes.RZXCalibrationBuilderNoEcho

class RZXCalibrationBuilderNoEcho(backend)

Creates calibrations for RZXGate(theta) by stretching and compressing Gaussian square pulses in the CX gate.

The RZXCalibrationBuilderNoEcho is a variation of the RZXCalibrationBuilder pass that creates calibrations for the cross-resonance pulses without inserting the echo pulses in the pulse schedule. This enables exposing the echo in the cross-resonance sequence as gates so that the transpiler can simplify them. The RZXCalibrationBuilderNoEcho only supports the hardware-native direction of the CX gate.

Initializes a RZXGate calibration builder.

Parameters

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

Raises

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

__init__(backend)

Initializes a RZXGate calibration builder.

Parameters

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

Raises

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

Methods

__init__(backend)	Initializes a RZXGate calibration builder.
get_calibration(params, qubits)	Builds the calibration schedule for the RZXGate(theta) without echos.
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)

Builds the calibration schedule for the RZXGate(theta) without echos.

Parameters

• 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.

Returns

The calibration schedule for the RZXGate(theta).

Return type

schedule

Raises

QiskitError – If the control and target qubits cannot be identified, or the backend does not support a cx gate between the qubits, or the backend does not natively support the specified direction of the cx.

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)

Parameters

• 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.

Returns

The play instruction with the stretched compressed

GaussianSquare pulse.

Return type

qiskit.pulse.Play

Raises

QiskitError – if the pulses are not GaussianSquare.

run(dag)

Run the calibration adder pass on dag.

Parameters

dag (DAGCircuit) – DAG to schedule.

Returns

A DAG with calibrations added to it.

Return type

DAGCircuit

supported(node_op)

Parameters

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

Returns

True if the node is a RZXGate.

Return type

match