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- W4316830053 abstract "Quantum Langevin noise makes experimental realization of genuine quantum-optical parity-time (PT) symmetry in a gain-loss-coupled open system elusive. Here, we challenge this puzzle 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 all previous studies involving phase-insensitive amplification (PIA), our PSA-loss scheme allows one quadrature pair to experience PT symmetry, a unique quantum effect without any classical counterpart. Such symmetry showcases many radical noise behaviors beyond conventional quantum squeezing and inaccessible to any PIA-based platform. Importantly, it is the only non-Hermitian system hitherto that enables the emergence of non-Hermiticity-induced quantum-to-classical transition for the same quantum observable when crossing exceptional point. Utilizing this quadrature-PT structure, we have further studied its potential in quantum sensing by exploring the quantum Cram'er-Rao bound or Fisher information. Besides, the proposed quadrature PT symmetry also sheds new light on protecting continuous-variable (CV) qubits from decoherence in lossy transmission, a long-standing conundrum for various CV-based quantum technologies." @default.
- W4316830053 created "2023-01-17" @default.
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- W4316830053 date "2023-01-13" @default.
- W4316830053 modified "2023-10-14" @default.
- W4316830053 title "Quantum-to-classical transition enabled by quadrature-PT symmetry" @default.
- W4316830053 doi "https://doi.org/10.48550/arxiv.2301.05511" @default.
- W4316830053 hasPublicationYear "2023" @default.
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