qblox_scheduler.schedules.two_qubit_transmon_schedules#

Module containing schedules for common two qubit experiments (transmon).

Functions#

chevron_cz_sched(...)

Chevron CZ calibration schedule that measures coupling of a qubit pair.

Module Contents#

chevron_cz_sched(lf_qubit: str, hf_qubit: str, amplitudes: float | numpy.ndarray, duration: float, flux_port: str | None = None, repetitions: int = 1) → qblox_scheduler.schedules.schedule.TimeableSchedule[source]#

Chevron CZ calibration schedule that measures coupling of a qubit pair.

This experiment provides information about the location of the \(|11\rangle \leftrightarrow |02\rangle\) avoided crossing and distortions in the flux-control line.

TimeableSchedule sequence

from qblox_scheduler.schedules.two_qubit_transmon_schedules import (
    chevron_cz_sched
)

sched = chevron_cz_sched(
    lf_qubit="q0",
    hf_qubit="q1",
    amplitudes=0.5,
    duration=20e-9,
)

sched.plot_circuit_diagram();
../../../../_images/index_0_04.png

Note

This schedule uses a unipolar square flux pulse, which will cause distortions and leakage. For a high quality CZ gate, distortions should be corrected for by modelling and subsequently inverting the transfer function of the flux-control line. See e.g. :cite:t:`Jerger2019` or :cite:t:`Rol2020` for more information.

Parameters:

  • lf_qubit – The name of a qubit, e.g., “q0”, the qubit with lower frequency.

  • hf_qubit – The name of coupled qubit, the qubit with the higher frequency.

  • amplitudes – An array (or scalar) of the flux pulse amplitude(s) in V.

  • duration – A scalar specifying the flux pulse duration in s.

  • flux_port – An optional string for a flux port. If None, this will default to the hf_qubit flux port ("{hf_qubit}:fl").

  • repetitions – The amount of times the TimeableSchedule will be repeated.

Returns:

: An experiment schedule.