Learning Feedback Control Strategies for Quantum Metrology

Alessio Fallani, Matteo A.C. Rossi, Dario Tamascelli, Marco G. Genoni*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

22 Citations (Scopus)
33 Downloads (Pure)


We consider the problem of frequency estimation for a single bosonic field evolving under a squeezing Hamiltonian and continuously monitored via homodyne detection. In particular, we exploit reinforcement learning techniques to devise feedback control strategies achieving increased estimation precision. We show that the feedback control determined by the neural network greatly surpasses in the long-time limit the performances of both the "no-control"strategy and the standard "open-loop control"strategy, which we considered as benchmarks. We indeed observe how the devised strategy is able to optimize the nontrivial estimation problem by preparing a large fraction of trajectories corresponding to more sensitive quantum conditional states.

Original languageEnglish
Article number020310
Pages (from-to)1-15
Number of pages15
JournalPRX Quantum
Issue number2
Publication statusPublished - 14 Apr 2022
MoE publication typeA1 Journal article-refereed


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