Optimized mitigation of random-telegraph-noise dephasing by spectator-qubit sensing and control
Issued Date
2023-03-01
Resource Type
ISSN
24699926
eISSN
24699934
Scopus ID
2-s2.0-85149658416
Journal Title
Physical Review A
Volume
107
Issue
3
Rights Holder(s)
SCOPUS
Bibliographic Citation
Physical Review A Vol.107 No.3 (2023)
Suggested Citation
Song H., Chantasri A., Tonekaboni B., Wiseman H.M. Optimized mitigation of random-telegraph-noise dephasing by spectator-qubit sensing and control. Physical Review A Vol.107 No.3 (2023). doi:10.1103/PhysRevA.107.L030601 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/82241
Title
Optimized mitigation of random-telegraph-noise dephasing by spectator-qubit sensing and control
Author(s)
Author's Affiliation
Other Contributor(s)
Abstract
Spectator qubits (SQs) are a tool to mitigate noise in hard-to-access data qubits. The SQ, designed to be much more sensitive to the noise, is measured frequently, and the accumulated results used rarely to correct the data qubits. For the hardware-relevant example of dephasing from random telegraph noise, we introduce a Bayesian method employing complex linear maps which leads to a plausibly optimal adaptive measurement and control protocol. The suppression of the decoherence rate is quadratic in the SQ sensitivity, establishing that the SQ paradigm works arbitrarily well in the right regime.