RZXCalibrationBuilder

class qiskit.transpiler.passes.RZXCalibrationBuilder(*args, **kwargs)

ベースクラス: CalibrationBuilder

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.

バージョン 0.22.0 で非推奨: qiskit.transpiler.passes.calibration.rzx_builder.RZXCalibrationBuilder.__init__()』s argument qubit_channel_mapping is deprecated as of qiskit-terra 0.22.0. It will be removed no earlier than 3 months after the release date.

パラメータ:

• instruction_schedule_map – The InstructionScheduleMap object representing the default pulse calibrations for the target backend

• qubit_channel_mapping – The list mapping qubit indices to the list of channel names that apply on that qubit.

• verbose – Set True to raise a user warning when RZX schedule cannot be built.

• target – The Target representing the target backend, if both instruction_schedule_map and this are specified then this argument will take precedence and instruction_schedule_map will be ignored.

例外:

QiskitError – Instruction schedule map is not provided.

Attributes

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.

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).

Methods

get_calibration(node_op, qubits)

Builds the calibration schedule for the RZXGate(theta) with echos.

パラメータ:

• node_op (CircuitInst) – Instruction 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.

戻り値:

The calibration schedule for the RZXGate(theta).

戻り値の型:

schedule

例外:

• QiskitError – if rotation angle is not assigned.

• QiskitError – If the control and target qubits cannot be identified.

• CalibrationNotAvailable – RZX schedule cannot be built for input node.

name()

Return the name of the pass.

static rescale_cr_inst(instruction, theta, sample_mult=16)

A builder macro to play stretched pulse.

パラメータ:

• 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.

戻り値:

Duration of stretched pulse.

例外:

QiskitError – if rotation angle is not assigned.

戻り値の型:

int

run(dag)

Run the calibration adder pass on dag.

パラメータ:

dag (DAGCircuit) – DAG to schedule.

戻り値:

A DAG with calibrations added to it.

戻り値の型:

DAGCircuit

supported(node_op, qubits)

Determine if a given node supports the calibration.

パラメータ:

• node_op (Instruction) – Target instruction object.

• qubits (list) – Integer qubit indices to check.

戻り値:

Return True is calibration can be provided.

戻り値の型:

bool