An important practical problem in the field of quantum metrology and sensors is to find the optimal sequences of controls for the quantum probe that realize optimal adaptive estimation. In Belliardo [arXiv:2312.16985], we solved this problem in general by introducing a procedure capable of optimizing a wide range of tasks in quantum metrology and estimation by combining model-aware reinforcement learning with Bayesian inference. We take a model-based approach to the optimization where the physics describing the system is explicitly taken into account in the training through automatic differentiation. In this follow-up paper we present some applications of the framework. The first family of examples concerns the estimation of magnetic fields, hyperfine interactions, and decoherence times for electronic spins in diamond. For these examples, we perform multiple Ramsey measurements on the spin. The second family of applications concerns the estimation of phases and coherent states on photonic circuits, without squeezing elements, where the bosonic lines are measured by photon counters. This exposition showcases the broad applicability of the method, which has been implemented in the qsensoropt library released on PyPI, which can be installed with pip.

Applications of model-aware reinforcement learning in Bayesian quantum metrology

Belliardo, Federico
;
Zoratti, Fabio;Giovannetti, Vittorio
2024

Abstract

An important practical problem in the field of quantum metrology and sensors is to find the optimal sequences of controls for the quantum probe that realize optimal adaptive estimation. In Belliardo [arXiv:2312.16985], we solved this problem in general by introducing a procedure capable of optimizing a wide range of tasks in quantum metrology and estimation by combining model-aware reinforcement learning with Bayesian inference. We take a model-based approach to the optimization where the physics describing the system is explicitly taken into account in the training through automatic differentiation. In this follow-up paper we present some applications of the framework. The first family of examples concerns the estimation of magnetic fields, hyperfine interactions, and decoherence times for electronic spins in diamond. For these examples, we perform multiple Ramsey measurements on the spin. The second family of applications concerns the estimation of phases and coherent states on photonic circuits, without squeezing elements, where the bosonic lines are measured by photon counters. This exposition showcases the broad applicability of the method, which has been implemented in the qsensoropt library released on PyPI, which can be installed with pip.
2024
Settore FIS/03 - Fisica della Materia
Bayesian networks; Inference engines; Quantum theory; Adaptive estimation; Bayesian; Bayesian inference; Combining model; Optimal sequence; Practical problems; Quantum metrology; Quantum probe; Quantum sensors; Reinforcement learnings
   National Quantum Science and Technology Institute
   NQSTI
   MUR
   PNRR

   TAMING COMPLEXITY WITH QUANTUM STRATEGIES: A HYBRID INTEGRATED PHOTONICS APPROACH
   QUSHIP
   MUR
   PRIN2017
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11384/145163
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