Tutorial: qubit calibration#
Tune up a qubit with Presto#
Performing all the standard qubit measurements is a good place to start learning how to program the
Presto API. In this tutorial, we begin with a simple resonator spectroscopy using
mode, and we continue with all the standard pulsed measurements using
pulsed mode. You can
view the complete source code of the example scripts in the presto-measure
repository. We recommend you read the examples in order as later measurements
build on previous ones. If you want to skip ahead, be sure to have a look at the first scripts
using each of the lockin and pulsed mode: Resonator spectroscopy and
Here’s a list of the examples in this tutorial with a brief description, click on the headers to view the related page. These measurements, and a few more, are also published in the Presto paper.
lockin – Simple single-frequency sweep on the resonator in continuous wave.
Power sweep of resonator#
lockin – 2D sweep of drive amplitude and frequency to the resonator.
Two-tone spectroscopy of the qubit#
lockin – Two-tone spectroscopy: 2D sweep of qubit drive amplitude and frequency, with
fixed resonator drive frequency and amplitude.
Rabi in amplitude#
pulsed – Rabi oscillations by driving the qubit with a pulse of variable amplitude and
constant duration. Multiple pulses can be applied to increase the accuracy of fitted results.
pulsed – 2D sweep where we measure Rabi oscillations by driving the qubit with a square
pulse of variable duration and variable amplitude. Fit the amplitude-dependent Rabi rate.
Relaxation time \(T_1\)#
pulsed – Measure the energy-relaxation time \(T_1\).
pulsed – Measure Ramsey oscillations by changing the delay between two \(\pi/2\) pulses. Fit
detuning of control frequency from qubit, and the coherence time \(T_2^*\).
Hahn echo \(T_2\)#
pulsed – Measure the decoherence time \(T_2\) with a Ramsey-echo experiment.
pulsed – Measure Ramsey fringes by changing the delay between two \(\pi/2\) pulses and their
detuning from the qubit frequency.
Resonator sweep with the qubit in the excited state#
pulsed – Pulsed frequency sweep of the resonator with and without a \(\pi\) pulse: plot and
fit resonance curves for ground and excited states, and find the optimal readout frequency.
Pulsed two-tone spectroscopy#
pulsed – Two-tone spectroscopy: 1D sweep of qubit drive frequency, with fixed amplitude
and fixed resonator drive frequency and amplitude.