Kavli Affiliate: Giordano Scappucci
| First 5 Authors: Kenji Capannelli, Kenji Capannelli, , ,
| Summary:
Solid-state qubits are sensitive to their microscopic environment, causing
the qubit properties to fluctuate on a wide range of timescales. The sub-Hz end
of the spectrum is usually dealt with by repeated background calibrations,
which bring considerable overhead. It is thus important to characterize and
understand the low-frequency variations of the relevant qubit characteristics.
In this study, we investigate the stability of spin qubit frequencies in the
Si/SiGe quantum dot platform. We find that the calibrated qubit frequencies of
a six-qubit device vary by up to $pm 100$ MHz while performing a variety of
experiments over a span of 912 days. These variations are sensitive to the
precise voltage settings of the gate electrodes, however when these are kept
constant to within 15 $mathrmmu$V, the qubit frequencies vary by less than
$pm 7$ MHz over periods up to 36 days. During overnight scans, the qubit
frequencies of ten qubits across two different devices show a standard
deviation below 200 kHz within a 1-hour time window. The qubit frequency noise
spectral density shows roughly a $1/f$ trend above $10^-4$ Hz and,
strikingly, a steeper trend at even lower frequencies.
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