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.
Parameters
backend (<module 'qiskit.providers.basebackend' from '/home/computertreker/git/qiskit/qiskit-dup/.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__
__init__(backend)
Initializes a RZXGate calibration builder.
Parameters
backend (<module 'qiskit.providers.basebackend' from '/home/computertreker/git/qiskit/qiskit-dup/.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) | type paramsList |
name() | Return the name of the pass. |
rescale_cr_inst(instruction, theta[, …]) | type instructionPlay |
run(dag) | Run the calibration adder pass on dag. |
supported(node_op) | type node_opDAGNode |
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
get_calibration(params, qubits)
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 cx between the qubits.
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).
name
name()
Return the name of the pass.
rescale_cr_inst
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
Raises
QiskitError – if the pulses are not GaussianSquare.
run
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
supported
supported(node_op)
Parameters
node_op (DAGNode) – The node from the dag dep.
Returns
True if the node is a RZXGate.
Return type
match