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Optical and Quantum Electronics

Phase dependence of entanglement generation in a PT-symmetric system of two micro-cavities

Vinh Le Duc, Hong Nguyen Thi, Quoc Khoa Doan

Published Feb 1, 2025• 0 citations
Publisher
DOI
10.1007/s11082-025-08045-y

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•Oct 10, 2025•0 citations
We consider two PT-symmetric models, consisting of two or three single-mode cavities. In both models, the cavities are coupled to each other by linear interactions, forming a linear chain. Additionally, the first and last of such cavities interact with an environment. Since the models are PT-symmetric, they are described by non-Hermitian Hamiltonians that, for a specific range of system parameters, possess real eigenvalues. We show that in the models considered in the article, the steering generation process strongly depends on the coupling strengths and rates of the gains/losses in energy. Moreover, we find the values of parameters describing the system for which the steering appears.
In this research, we study the coherent perfect absorption (CPA) induced entanglement in Anti-PT symmetric three-waveguide system. The quantum Anti-PT phase diagram of the three-waveguide system is obtained. Based on the phase diagram, we calculated the transmission spectrum of the system in Anti-PT symmetric phase to demonstrate its CPA behavior. Finally, the output entanglement negativity of a separable input state is investigated. Non-zero negativity shows that entanglement is generated and protected by CPA against dissipation in the system. Our research prompts the study on quantum Anti-PT symmetric system and quantum CPA, and may have potentials in integrated quantum information processing.