Quantum PT-Phase Diagram in a Non-Hermitian Photonic Structure
- URL: http://arxiv.org/abs/2303.00189v3
- Date: Mon, 4 Sep 2023 02:51:05 GMT
- Title: Quantum PT-Phase Diagram in a Non-Hermitian Photonic Structure
- Authors: Xinchen Zhang and Yun Ma and Qi Liu and Nuo Wang and Yali Jia and Qi
Zhang and Zhanqiang Bai and Junxiang Zhang and Qihuang Gong and Ying Gu
- Abstract summary: We analytically obtained the quantum PT-phase diagram under the steady state condition.
This diagram paves the way to the quantum state engineering, quantum interferences, and logic operations in non-Hermitian photonic systems.
- Score: 9.850404959345031
- License: http://creativecommons.org/licenses/by-nc-sa/4.0/
- 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.
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