Variational quantum metrology for multiparameter estimation under dephasing noise

• URL: http://arxiv.org/abs/2305.08289v2
• Date: Thu, 12 Oct 2023 08:43:19 GMT
• Title: Variational quantum metrology for multiparameter estimation under dephasing noise
• Authors: Trung Kien Le and Hung Q. Nguyen and Le Bin Ho
• Abstract summary: We present a hybrid quantum-classical variational scheme to enhance precision in quantum metrology. We discuss specific applications to 3D magnetic field sensing under several dephasing noise modes.
• Score: 0.8594140167290099
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We present a hybrid quantum-classical variational scheme to enhance precision in quantum metrology. In the scheme, both the initial state and the measurement basis in the quantum part are parameterized and optimized via the classical part. It enables the maximization of information gained about the measured quantity. We discuss specific applications to 3D magnetic field sensing under several dephasing noise modes. Indeed, we demonstrate its ability to simultaneously estimate all parameters and surpass the standard quantum limit, making it a powerful tool for metrological applications.

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