Real-time adaptation of quantum noise channel estimates

• URL: http://arxiv.org/abs/2501.18685v1
• Date: Thu, 30 Jan 2025 19:00:01 GMT
• Title: Real-time adaptation of quantum noise channel estimates
• Authors: Lucas Daguerre, Mohan Sarovar,
• Abstract summary: We propose a method to perform real-time adaptation of noise channel estimates during the execution of a quantum algorithmic circuit. We demonstrate and evaluate the technique, which can be seen as a protocol for real-time calibration of high-level gate error information.
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• Abstract: Estimates of noise channels for quantum gates are required for most error mitigation techniques and are desirable for informing quantum error correction decoders. These estimates can be obtained by resource-intensive off-line characterization techniques, but can become stale due to device drift and fluctuations. We propose a method to address this issue by performing real-time adaptation of noise channel estimates during the execution of a quantum algorithmic circuit using extended flag gadgets, mid-circuit measurements and Bayesian inference. We carry out analytical calculations and numerical simulations employing a Dirichlet prior distribution for the error rates in a Pauli channel to demonstrate and evaluate the technique, which can be seen as a protocol for real-time calibration of high-level gate error information.

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