Quantum sensing in an exciton-polariton condensate

• URL: http://arxiv.org/abs/2407.14590v1
• Date: Fri, 19 Jul 2024 18:00:00 GMT
• Title: Quantum sensing in an exciton-polariton condensate
• Authors: Jorge Chávez-Carlos, Daniela Garrido-Ramírez, A. J. Vega Carmona, Victor S. Batista, Francisco Pérez-Bernal, Carlos A. Trallero-Herrero, M. A. Bastarrachea-Magnani, Lea F. Santos,
• Abstract summary: We show that even if the system lacks a quantum phase transition, the quantum Fischer information can still be amplified due to the presence of an excited-state quantum phase transition (ESQPT) Our study showcases the relationship between non-conventional quantum critical phenomena and quantum sensing with potential experimental applications in exciton-polariton systems.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The extreme sensitivity of critical systems has been explored to improve quantum sensing and weak signal detection. The closing of the energy gap and abrupt change in the nature of the ground state at a quantum phase transition (QPT) critical point enhance indicators of parameter estimation, such as the quantum Fischer information. Here, we show that even if the system lacks a QPT, the quantum Fischer information can still be amplified due to the presence of an excited-state quantum phase transition (ESQPT). This is shown for a light-driven anharmonic quantum oscillator model that describes the low-lying spectrum of an exciton-polariton condensate proposed as a platform for quantum computation. In the classical limit, the ESQPT translates into the emergence of a hyperbolic point that explains the clustering of the energy levels at the vicinity of the ESQPT and the changed structure of the corresponding eigenstates, justifying the enhanced sensitivity of the system. Our study showcases the relationship between non-conventional quantum critical phenomena and quantum sensing with potential experimental applications in exciton-polariton systems.

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