Kavli Affiliate: Giordano Scappucci
| First 5 Authors: Sam R. Katiraee-Far, Yuta Matsumoto, Brennan Undseth, Maxim De Smet, Valentina Gualtieri
| Summary:
Developing optimal strategies to calibrate quantum processors for
high-fidelity operation is one of the outstanding challenges in quantum
computing today. Here, we demonstrate multiple examples of high-fidelity
operations achieved using a unified global optimization-driven automated
calibration routine on a six dot semiconductor quantum processor. Within the
same algorithmic framework we optimize readout, shuttling and single-qubit
quantum gates by tailoring task-specific cost functions and tuning parameters
based on the underlying physics of each operation. Our approach reaches
systematically $99%$ readout fidelity, $>99%$ shuttling fidelity over an
effective distance of 10$mu$m, and $>99.5%$ single-qubit gate fidelity on
timescales similar or shorter compared to those of expert human operators. The
flexibility of our gradient-free closed loop algorithmic procedure allows for
seamless application across diverse qubit functionalities while providing a
systematic framework to tune-up semiconductor quantum devices and enabling
interpretability of the identified optimal operation points.
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