Quantum metrology using time-frequency as quantum continuous variables: Resources, sub shot-noise precision and phase space representation

• URL: http://arxiv.org/abs/2210.05511v5
• Date: Tue, 19 Dec 2023 20:23:25 GMT
• Title: Quantum metrology using time-frequency as quantum continuous variables: Resources, sub shot-noise precision and phase space representation
• Authors: Eloi Descamps, Nicolas Fabre, Arne Keller and Perola Milman
• Abstract summary: We study the role of the electromagnetic field's frequency in time precision measurements using single photons as a paradigmatic system. We show that it is possible to observe a quadratic scaling using quantum mode correlations only and explicit the mathematical expression of states saturating the Heisenberg limit.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We study the role of the electromagnetic field's frequency in time precision measurements using single photons as a paradigmatic system. For such, we independently identify the contributions of intensity and spectral resources and show that both can play a role on the scaling of the precision of parameter estimation with the number of probes. We show in particular that it is possible to observe a quadratic scaling using quantum mode correlations only and explicit the mathematical expression of states saturating the Heisenberg limit. We also provide a geometrical and phase space interpretation of our results, and observe a curious quantum-to-classical-like transition on scaling by modifying the spectral variance of states. Our results connect discrete and continuous aspects of single photons and quantum optics by considering from a quantum mechanical perspective the role of frequency.

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