Quantum squeezing and sensing in quadrature parity-time symmetry

Jianming Wen; Wencong Wang; Yanhua Zhai; Dongmei Liu; Xiaoshun Jiang; Saeid V. Ghamsari

doi:10.1117/12.2657392

9 March 2023 Quantum squeezing and sensing in quadrature parity-time symmetry

Jianming Wen, Wencong Wang, Yanhua Zhai, Dongmei Liu, Xiaoshun Jiang, Saeid V. Ghamsari

Proceedings Volume PC12447, Quantum Sensing, Imaging, and Precision Metrology; PC1244711 (2023) https://doi.org/10.1117/12.2657392
Event: SPIE Quantum West, 2023, San Francisco, California, United States

Abstract

Quantum Langevin noise makes the observation of quantum-optical parity-time (PT) symmetry in an open system with both gain and loss elusive. Here, we challenge this problem by exploiting twin beams produced from a nonlinear parametric process, one undergoing phase-sensitive linear quantum amplification (PSA) and the other engaging balanced loss merely. Unlike previous studies involving phase-insensitive linear quantum amplification (PIA), our PSA-loss scheme enables only one pair of quadratures to evolve PT-symmetrically with variances transiting from periodic oscillations to exponential growths when crossing an exceptional point (EP), while tailors the conjugate pair with PT-adjusted quadrature squeezing. We further investigate such asymmetric PT-quadrature squeezing for quantum sensing by evaluating the quantum Cramer–Rao bound with distinct features beyond existing protocols. The proposed quadrature PT sheds new light on continuous-variable based quantum information and technology.

Conference Presentation

Citation Download Citation

Jianming Wen, Wencong Wang, Yanhua Zhai, Dongmei Liu, Xiaoshun Jiang, and Saeid V. Ghamsari "Quantum squeezing and sensing in quadrature parity-time symmetry", Proc. SPIE PC12447, Quantum Sensing, Imaging, and Precision Metrology, PC1244711 (9 March 2023); https://doi.org/10.1117/12.2657392

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