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Physics > Optics
Title: Quantum PT-Phase Diagram in a Non-Hermitian Photonic Structure
(Submitted on 1 Mar 2023 (v1), last revised 4 Sep 2023 (this version, v3))
Abstract: Photonic structures have an inherent advantage to realize PT-phase transition through modulating the refractive index or gain-loss. However, quantum PT properties of these photonic systems have not been comprehensively studied yet. Here, in a bi-photonic structure with loss and gain simultaneously existing, we analytically obtained the quantum PT-phase diagram under the steady state condition. To characterize the PT-symmetry or -broken phase, we define an Hermitian exchange operator expressing the exchange between quadrature variables of two modes. If inputting several-photon Fock states into a PT-broken bi-waveguide splitting system, most photons will concentrate in the dominant waveguide with some state distributions. Quantum PT-phase diagram paves the way to the quantum state engineering, quantum interferences, and logic operations in non-Hermitian photonic systems.
Submission history
From: Gu Ying [view email][v1] Wed, 1 Mar 2023 02:36:40 GMT (546kb,D)
[v2] Thu, 2 Mar 2023 03:40:57 GMT (546kb,D)
[v3] Mon, 4 Sep 2023 02:51:05 GMT (1401kb,D)
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