https://doi.org/10.1140/epjd/s10053-025-01035-5
Regular Article
Criticality-enhanced single-molecule frequency estimation via optical modification and squeezing parametric amplification
Hubei Key Laboratory of Energy Storage and Power Battery and Hubei Key Laboratory of Automotive Power Train and Electronic Control, Shiyan Key Laboratory of Electromagnetic Induction and Energy Saving Technology, and Shiyan Key Laboratory of Quantum Information and Precision Optics, Hubei University of Automotive Technology, 442002, Shiyan, China
Received:
31
January
2025
Accepted:
26
June
2025
Published online:
15
July
2025
We investigate a tripartite quantum system composed of a plasmon cavity, respectively, coupled to a single polarized molecule and an optical cavity. The aim is to explore the criticality-enhanced single-molecule frequency estimation by means of optical modification (OM) and squeezing parametric amplification (SPA) in together. In this context, we initially summarize the critical behaviors and patterns. Specifically, we identify a squeezing-degree-dependent critical point (CP) of one supermode. The eigen energy near the critical point shows a remarkable sensitivity to the weak mechanical frequency fluctuations. Consequently, we anticipate a significant augmentation in the precision of single-molecule frequency estimation utilizing this hybrid system. Within the framework of quantum metrology, a comprehensive evaluation of the measurement precision in the critical regime reveals the capacity of this proposal is significantly enhanced via a joint cooperation of OM and SPA.
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© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2025
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
