Note

This is the documentation for the current state of the development branch of Qiskit Experiments. The documentation or APIs here can change prior to being released.

EchoedCrossResonance

class EchoedCrossResonance(basis_gates=None, default_values=None, target_pulses=True)[source]

A library for echoed cross-resonance gates.

The cr45p and cr45m include a pulse on the control qubit and optionally a pulse on the target qubit.

Provided gates:

  • cr45p: GaussianSquare cross-resonance gate for a \(+\pi/4\) rotation.

  • cr45m: GaussianSquare cross-resonance gate for a \(-\pi/4\) rotation.

  • ecr: Echoed cross-resonance gate defined as cr45p - x - cr45m.

  • rzx: RZXGate built from the ecr as cr45p - x - cr45m - x.

Required gates:
Pulse parameters:

  • tgt_amp: The amplitude of the pulse applied to the target qubit. Default value: 0.

  • σ: The standard deviation of the flanks. Default value: 64 samples.

  • amp: The amplitude of the pulses applied to the control qubit. Default value: 50%.

  • duration: The duration of the cr45p and cr45m pulses. Default value: 1168 samples.

  • risefall: The number of σ’s in the flanks of the pulses. Default value: 2.

Setup the library.

Parameters:

  • basis_gates (List[str] | None) – The basis gates to generate.

  • default_values (Dict | None) – A dictionary to override library default parameter values.

  • target_pulses (bool) – If True (the default) then drives will be added to the target qubit during the CR tones on the control qubit.

Attributes

basis_gates

Return the basis gates supported by the library.

Methods

__getitem__(name)

Return the schedule.

Return type:

ScheduleBlock

__len__()

The length of the library defined as the number of basis gates.

config()

Return the settings used to initialize the library.

Return type:

Dict[str, Any]

default_values()[source]

The default values of the CR library.

Return type:

List[DefaultCalValue]

classmethod from_config(config)

Deserialize the library given the input dictionary

Return type:

BasisGateLibrary

get(k[, d]) → D[k] if k in D, else d.  d defaults to None.
items() → a set-like object providing a view on D's items
keys() → a set-like object providing a view on D's keys
num_qubits(name)

Return the number of qubits that the schedule with the given name acts on.

Return type:

int

values() → an object providing a view on D's values