RZXCalibrationBuilderNoEcho
RZXCalibrationBuilderNoEcho(instruction_schedule_map=None, qubit_channel_mapping=None, verbose=True)
Bases: qiskit.transpiler.passes.calibration.rzx_builder.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
- 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. - verbose (
bool) – Set True to raise a user warning when RZX schedule cannot be built.
Raises
QiskitError – Instruction schedule map is not provided.
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 rotation angle is not assigned.
- QiskitError – If the control and target qubits cannot be identified, or the backend does not natively support the specified direction of the cx.
- CalibrationNotAvailable – RZX schedule cannot be built for input node.
name
RZXCalibrationBuilderNoEcho.name()
Return the name of the pass.
rescale_cr_inst
static RZXCalibrationBuilderNoEcho.rescale_cr_inst(instruction, theta, sample_mult=16)
A builder macro to play stretched pulse.
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.
Return type
int
Returns
Duration of stretched pulse.
Raises
QiskitError – if rotation angle is not assigned.
run
RZXCalibrationBuilderNoEcho.run(dag)
Run the calibration adder pass on dag.
Parameters
dag (DAGCircuit) – DAG to schedule.
Return type
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).