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Non-Markovianity of an atom in a semi-infinite rectangular waveguide

Chinese Physics B 2023年第3期32卷 102-110页

作者：曾静宋亚菊卢竞周兰 Key Laboratory of Low-Dimensional Quantum Structures and and Quantum Control of the Ministry of Education Department of Physics and Synergetic Innovation Center of Quantum Effects and ApplicationsKey Laboratory for Matter Microstructure and Function of Hunan ProvinceHunan Normal UniversityChangsha 410081China College of Physics and Electronic Engineering Hengyang Normal UniversityHengyang 421002China

We investigate the non-Markovianity(NM)of a waveguide qed with a two-level atom as the system and a semiinfinite rectangular waveguide as the environment,where the transverse magnetic(TM_(mn))modes define the quantum channels of guided *** perfect mirror imposed by the finite end exerts a retarded feedback mechanism to allow for information backflow,which leads to NM *** the energy separation of the atom far away from the cutoff frequencies of transverse modes,the delay differential equations are obtained with single-excitation initial in the *** attention is focused on the effects of multiple quantum channels involved in guiding photons on the degree of nonMarkovian *** asymptotic value of the non-Markovianity N_(1)can be found as the atom–mirror distance is large enough,however,the asymptotic value of N_(2)of the atom interacting with the effective double-modes is lower than that of the atom interacting with the effective *** also show that N_(1)is a constant,and the analytical expression for N_(2)is related to the parameters associated with the modes,which is related to the interference of the two modes.

关键词： open system non-Markovianity waveguide qed quantum information

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The interference between a giant atom and an internal resonator

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Communications in Theoretical Physics 2021年第11期73卷 102-107页

作者： Xiao-Pei Yang Zhi-Kun Han Wen Zheng Dong Lan Yang Yu National Laboratory of Solid State Microstructures School of PhysicsNanjing UniversityNanjing 210093China

The Jaynes–Cummings model plays an important role in quantum entanglement and state ***,we discuss how to realize it in a waveguide-mediated interaction system,which comprises a giant atom and a *** show the vacuum Rabi splitting and discuss how to achieve a unidirectional *** extend the Purcell effect in c qed to this waveguide qed system,showing how to control the giant atom decay *** design can further be built experimentally and has application in quantum manipulation.

关键词： interference quantum optics waveguide qed

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Non-Markovian Master Equation for Distant Resonators Embedded in a One-Dimensional waveguide

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Communications in Theoretical Physics 2018年第9期69卷 273-279页

作者： Xin-Yu Chen Wen-Zhao Zhang Chong Li School of Physics Dalian University of TechnologyBeijing Computational Science Research Cente

We develop a master equation approach to describe the dynamics of distant resonators coupled through a one-dimensional waveguide. Our method takes into account the back-actions of the reservoirs, and enables us to calculate the exact dynamics of the complete system at all times. We show that such system can cause nonexponential and long-lived photon decay due to the existence of a relaxation effect. The physical origin of non-Markovianity in our model system is the finite propagation speed resulting in time delays in communication between the nodes, and strong decay rate of the emitters into the waveguide. When the distance satisfies the standing wave condition, we find that when the time delay is increased, the dark modes formation is no longer perfect, and the average photon number of dark mode decreases in steady time limit.

关键词： non-Markovian master equation quantum network waveguide qed

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