Quantum probes for the characterization of nonlinear media

Alessandro Candeloro, Sholeh Razavian, Matteo Piccolini, Berihu Teklu, Stefano Olivares, Matteo G.A. Paris

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Active optical media leading to interaction Hamiltonians of the form H = λ (a + a )ζ represent a crucial resource for quantum optical technology. In this paper, we address the characterization of those nonlinear media using quantum probes, as opposed to semiclassical ones. In particular, we investigate how squeezed probes may improve individual and joint estimation of the nonlinear coupling λ and of the nonlinearity order ζ. Upon using tools from quantum estimation, we show that: (i) the two parameters are compatible, i.e., the may be jointly estimated without additional quantum noise; (ii) the use of squeezed probes improves precision at fixed overall energy of the probe; (iii) for low energy probes, squeezed vacuum represent the most convenient choice, whereas for increasing energy an optimal squeezing fraction may be determined; (iv) using optimized quantum probes, the scaling of the corresponding precision with energy improves, both for individual and joint estimation of the two parameters, compared to semiclassical coherent probes. We conclude that quantum probes represent a resource to enhance precision in the characterization of nonlinear media, and foresee potential applications with current technology.

Original languageBritish English
Article number1353
JournalEntropy
Volume23
Issue number10
DOIs
StatePublished - Oct 2021

Keywords

  • Multiparameter estimation
  • Quantum metrology
  • Quantum probes
  • Quantum sensing

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