Journal
ENTROPY
Volume 23, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/e23101353
Keywords
quantum sensing; quantum metrology; quantum probes; multiparameter estimation
Categories
Funding
- Khalifa University [8474000358 (FSU-2021-018)]
- MAECI through the project ENYGMA [PGR06314]
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The paper explores the characterization of nonlinear media using quantum probes, showing that squeezed probes can improve precision in estimating parameters. The study demonstrates that quantum probes can enhance precision and optimize squeezing fractions for different energy probes.
Active optical media leading to interaction Hamiltonians of the form H=lambda & SIM;(a+a & DAG;)zeta 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 lambda & SIM; and of the nonlinearity order zeta. 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.
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