Non-Hermitian Control of Multimode Duan-PPT Criteria and Steering in Energy-Level Cascaded Four-Wave Mixing Processes

IF 4.4 Q1 OPTICS Advanced quantum technologies Pub Date : 2024-06-19 DOI:10.1002/qute.202400082
Jiajia Wei, Cheng Huang, Yandong He, Jiaxuan Wei, Wenqiang Qin, Haitian Tang, Ning Li, Feng Li, Yin Cai, Bo Li, Yanpeng Zhang
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Abstract

The non-Hermitian singularity control of multimode entanglement in the energy-level cascaded four-wave mixing system within a single atomic vapor is of great significance and importance. In this study, a non-Hermiticity system by means of quasi-quantization of energy-band based on non-Hermiticity systems is constructed. By employing atomic coherence in the non-Hermiticity system, high-dimensional quantized photon correlations underdressed field-induced parity-time (PT) symmetry and symmetry breaking through the quantization of energy levels are studied. Such a phenomenon happens at microscopic (nanoscale) when the eigenvalues of dressed energy-level and multimode entanglement are considered for both real and imaginary parts symmetry breaking. Double dressing effect is observed with more coherent channels and larger information capacity than single dressing in the energy-level cascaded four-wave mixing system. The study found that the splitting of the real part is larger than an imaginary part in a second-order system, and the imaginary part splitting is also greater than the real part splitting in a third-order system. The real part (in phase) is constructive dressing quantization, and the imaginary (out of phase) is destructive dressing quantization. Exceptional points (EP points) can be used to enhance sensitivity detection of entanglement quantum state.

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能量级联四波混合过程中多模段-PPT 准则和转向的非赫米提控制
在单个原子蒸汽内的能级级联四波混合系统中,对多模纠缠的非ermitian奇异性控制具有重要意义和重要性。在本研究中,通过基于非ermiticity 系统的能带准量子化,构建了一个非Hermiticity 系统。通过在非恒星系统中利用原子相干性,研究了场诱导的奇偶时(PT)对称性和对称性破缺下的高维量子化光子相关性,以及通过能级量子化实现的对称性破缺。在考虑实部和虚部对称性破缺时,这种现象发生在微观(纳米尺度)上,即敷料能级的特征值和多模纠缠。在能级级联四波混合系统中,观察到双穿衣效应比单穿衣效应具有更多的相干通道和更大的信息容量。研究发现,在二阶系统中,实部分裂大于虚部分裂,而在三阶系统中,虚部分裂也大于实部分裂。实部(同相)是建设性修整量化,虚部(异相)是破坏性修整量化。例外点(EP 点)可用于提高纠缠量子态的检测灵敏度。
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