Optimized mitigation of random-telegraph-noise dephasing by spectator-qubit sensing and control

• URL: http://arxiv.org/abs/2205.12567v3
• Date: Wed, 21 Dec 2022 08:14:50 GMT
• Title: Optimized mitigation of random-telegraph-noise dephasing by spectator-qubit sensing and control
• Authors: Hongting Song, Areeya Chantasri, Behnam Tonekaboni, Howard M. Wiseman
• Abstract summary: Spectator qubits (SQs) are a tool to mitigate noise in hard-to-access data qubits. 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.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• 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.

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