Quantum sensing in Kerr parametric oscillators

• URL: http://arxiv.org/abs/2407.14590v2
• Date: Tue, 27 Aug 2024 17:04:28 GMT
• Title: Quantum sensing in Kerr parametric oscillators
• Authors: Jorge Chávez-Carlos, Daniela Garrido-Ramírez, A. J. Vega Carmona, Victor S. Batista, Carlos A. Trallero-Herrero, Francisco Pérez-Bernal, M. A. Bastarrachea-Magnani, Lea F. Santos,
• Abstract summary: Changes in the ground state at a QPT enhance indicators of parameter estimation. In systems that lack a QPT, quantum sensitivity can still be enhanced due to excited-state quantum phase transitions.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Quantum phase transitions (QPTs) are explored to improve quantum sensing and weak signal detection. Changes in the ground state at a QPT enhance indicators of parameter estimation, such as the quantum Fischer information. Here, we show that in systems that lack a QPT, quantum sensitivity can still be enhanced due to excited-state quantum phase transitions (ESQPTs). Our analysis is done for a Kerr parametric oscillator with two ESQPTs associated with the onset of a hyperbolic point and a local maximum in the classical limit. These points change the system's phase space structure, which results in the amplification of the quantum Fisher information and the squeezing of the uncertainty in position at specific values of the control parameter. Our study showcases the relationship between non-conventional quantum critical phenomena and quantum sensing with potential experimental applications in exciton-polariton condensates and superconducting circuits.

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