RZXCalibrationBuilderNoEcho
class RZXCalibrationBuilderNoEcho(backend=None, instruction_schedule_map=None, qubit_channel_mapping=None)
Bases: qiskit.transpiler.passes.calibration.builders.RZXCalibrationBuilder
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 (
Union[BaseBackend,BackendV1,None]) – DEPRECATED a backend object to build the calibrations for. Use of this argument is deprecated in favor of directly specifyinginstruction_schedule_mapandqubit_channel_map. - instruction_schedule_map (
Optional[InstructionScheduleMap]) – TheInstructionScheduleMapobject representing the default pulse calibrations for the target backend - qubit_channel_mapping (
Optional[List[List[str]]]) – The list mapping qubit indices to the list of channel names that apply on that qubit.
Raises
QiskitError – if open pulse is not supported by the backend.
Methods
get_calibration
RZXCalibrationBuilderNoEcho.get_calibration(node_op, qubits)
Builds the calibration schedule for the RZXGate(theta) without echos.
Parameters
- node_op (
Instruction) – 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.
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.
name
RZXCalibrationBuilderNoEcho.name()
Return the name of the pass.
rescale_cr_inst
static RZXCalibrationBuilderNoEcho.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
RZXCalibrationBuilderNoEcho.run(dag)
Run the calibration adder pass on dag.
Parameters
dag (DAGCircuit) – DAG to schedule.
Return type
DAGCircuit
Returns
A DAG with calibrations added to it.
supported
RZXCalibrationBuilderNoEcho.supported(node_op, qubits)
Determine if a given node supports the calibration.
Parameters
- node_op (
Instruction) – Target instruction object. - qubits (
List) – Integer qubit indices to check.
Return type
bool
Returns
Return True is calibration can be 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).