two_qubit_transmon_schedules#

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

Module Contents#

Functions#

chevron_cz_sched(...)

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

chevron_cz_sched(lf_qubit: str, hf_qubit: str, amplitudes: float | numpy.ndarray, duration: float, flux_port: str | None = None, repetitions: int = 1) → quantify_scheduler.schedules.schedule.Schedule[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.

Schedule sequence

from quantify_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();

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. Jerger et al. [JKVF19] or Rol et al. [RCM+20] 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 Schedule will be repeated.

Returns:

An experiment schedule.