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Few-photon routing via chiral light-matter couplings

Communications in Theoretical Physics 2022年第2期74卷 28-35页

作者： Ya Yang Jing Lu Lan Zhou Synergetic Innovation Center for Quantum Effects and Applications Key Laboratory for Matter Microstructure and Function of Hunan ProvinceKey Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of EducationSchool of Physics and ElectronicsHunan Normal UniversityChangsha 410081China

A quantum router is one of the essential elements in the quantum *** routers only direct a single photon from one quantum channel into ***,we propose a fewphoton *** active element of the router is a single qubit chirally coupled to two independent waveguides simultaneously,where each waveguide mode provides a quantum *** introducing the operators of the scatter-free space and the controllable space,the output state of the one-photon and two-photon scattering are derived *** is found that the qubit can direct one and two photons from one port of the incident waveguide to an arbitrarily selected port of the other waveguide with unity,***,two photons cannot be simultaneously routed to the same port due to the anti-bunch effect.

关键词： few-photon routing nonreciprocity anti-bunching chiral waveguides

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Coherent control of spin tunneling in a driven spin–orbit coupled bosonic triple well

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Communications in Theoretical Physics 2022年第5期74卷 45-50页

作者： Yuxin Luo Jia Yi Wenjuan Li Xin Xie Yunrong Luo Wenhua Hai Key Laboratory for Matter Microstructure and Function of Hunan Province and Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of Ministry of EducationSchool of Physics and ElectronicsHunan Normal UniversityChangsha 410081 China School of Management Hunan University of Information TechnologyChangsha 410151 China

We investigate the coherent control of spin tunneling for a spin–orbit(SO)coupled boson trapped in a driven triple *** the high-frequency limit,the quasienergies of the system are obtained analytically and the fine energy band structures are *** regulating the driving parameters,we reveal that the directed spin-flipping or spin-conserving tunneling of an SOcoupled boson occurs along different pathways and in different *** analytical results are demonstrated by numerical simulations and good agreements are ***,an interesting scheme of quantum spin tunneling switch with or without spin-flipping is *** results may have potential applications in the design of spintronic devices.

关键词： coherent control spin tunneling spin-orbit coupling triple well

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Exploring bottom-charmed molecular tetraquarks with complex scaling method

arXiv

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arXiv 2025年

作者： Song, Qing-Fu Liang, Wei Lü, Qi-Fang Xiong, Xiao-Nu School of Physics Central South University Changsha410083 China Department of Physics Hunan Normal University Changsha410081 China Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control Ministry of Education Changsha410081 China Key Laboratory for Matter Microstructure and Function of Hunan Province Hunan Normal University Changsha410081 China

In this work, we analyze the D((∗s))B((∗s)) interactions by adopting the one boson exchange model from a coupled channel perspective. For I(JP) = 1(1+) DB∗/D∗B/D∗B∗ system, utilizing the complex scaling method, we obtain a loosely bound state and two resonant states below DB∗, D∗B, and D∗B∗ thresholds, respectively. Assuming that charmonium-like states Tcc¯1(3900), Tcc¯1(4020) and bottomonium-like states Tbb¯1(10610), Tbb¯1(10650) are molecular states near the corresponding thresholds, we suggest these predicted particles in I(JP) = 1(1+) system as their analogues. In addition, we extend our study to other D((∗s))B((∗s)) combinations with different quantum numbers. According to our estimations, there may exist some exotic structures in bottom-charmed sector. Finally, we collect the possible decay channels for future experimental observations. The Bc/B∗c plus a light meson are the ideal final state to search for the bound states, while the D((∗s))B((∗s)) channels are suitable for the resonances. We highly recommend that the future experiments hunt for these bottom-charmed exotic particles. Copyright © 2025, The Authors. All rights reserved.

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Deterministic generation of multi-photon bundles in a quantum Rabi model

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Science China(Physics,Mechanics & Astronomy) 2023年第2期66卷 1-12页

作者： Cheng Liu Jin-Feng Huang Lin Tian Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan ProvinceDepartment of Physics and Synergetic Innovation Center for Quantum Effects and ApplicationsHunan Normal UniversityChangsha 410081China School of Natural Sciences University of CaliforniaMerced 95343USA

Multi-photon bundle states are crucial for a broad range of applications such as quantum metrology,quantum lithography,quantum communication,and quantum *** we propose a scheme that generates multi-photon bundles via virtual excitations in a quantum Rabi *** approach utilizes a Ξ-type three-level atom,where the upper two levels are coupled to a cavity field to form a quantum Rabi model with ultrastrong coupling,and the transition between the lower two levels is driven by two sequences of Gaussian *** show that the driving pulses induce deterministic emission of multiple photons from the eigenstates of the quantum Rabi model via the stimulated Raman adiabatic passage technique,and hence can create bundles of multiple photons on-demand in the cavity output *** calculate the generalized second-order correlation functions of the output photons,which reveal that the emitted photons form antibunched multi-photon bundles.

关键词： field quantum bundles

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Entanglement of two distinguishable atoms in a rectangular waveguide:Linear approximation with single excitation

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Chinese Physics B 2021年第9期30卷 123-130页

作者： Jing Li Lijuan Hu Jing Lu Lan Zhou Affiliation Synergetic Innovation Center for Quantum Effects and Applications Key Laboratory for Matter Microstructure and Function of Hunan ProvinceKey Laboratory of Low-Dimensional Quantum Structures and Quantum Control of the Ministry of EducationSchool of Physics and ElectronicsHunan Normal UniversityChangsha 410081China College of Science Hunan University of Science and EngineeringYongzhou 425199China

We investigate the entanglement dynamics of two distinguishable two-level systems(TLSs)characterized by energy differenceδlocated inside a rectangular hollow metallic waveguide of transverse dimensions a and *** effects of energy differenceδand the inter-TLS distance on the time evolution of the concurrence of the TLSs are examined in the single excitation subspace when the energy separation of the TLS is far away from the cutoff frequencies of the transverse mode.

关键词： entanglement concurrence two two-level systems energy separations

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

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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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In situ electrochemical dehydrogenation of ultrathin Co(OH)_(2) nanosheets for enhanced hydrogen evolution

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Chinese Chemical Letters 2023年第1期34卷 469-473页

作者： Qian Zhou Qihang Bian Liling Liao Fang Yu Dongyang Li Dongsheng Tang Haiqing Zhou Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of EducationKey Laboratory for Matter Microstructure and Function of Hunan ProvinceHunan Normal UniversityChangsha 410081China Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy Hunan UniversityChangsha 410082China

Transition metal hydroxides/oxyhydroxides have recently emerged as highly active electrocatalysts for oxygen evolution reaction in alkaline water electrolysis,while have not yet been widely investigated for hydrogen evolution electrocatalysts owing to their unfavorable H*-adsorption,making it difficult to construct an overall-water-splitting cell for hydrogen *** this work,we proposed a straightforward and effective approach to develop an efficient in-plane heterostructured CoOOH/Co(OH)_(2) catalyst via in-situ electrochemical dehydrogenation method,in which the dehydrogenated–CoOOH and Co(OH)_(2) at the surface synergistically boost the hydrogen evolution reaction(HER)kinetics in base as confirmed by high-resolution transmission electron microscope,synchrotron X-ray absorption spectroscopy,and electron energy loss *** to the in-situ dehydrogenation of ultrathin Co(OH)_(2) nanosheets,the catalytic activity of the CoOOH/Co(OH)_(2) heterostructures is progressively improved,which exhibit outstanding hydrogen-evolving activity in base requiring a low overpotential of 132 m V to afford 10 m A/cm^(2)with very fast reaction kinetics after 60 h *** gradually improved catalytic performance for the CoOOH/Co(OH)2is probably due to the enhanced H*-adsorption induced by the synergistic effect of heterostructures and better conductivity of Co OOH relative to electrically insulating Co(OH)_(2).This work will open the opportunity for a new family of transition metal hydroxides/oxyhydroxides as active HER catalysts,and also highlight the importance of using in situ techniques to construct precious metal-free efficient catalysts for alkaline hydrogen evolution.

关键词： Hydrogen evolution reaction Transition metal hydroxide In-situ electrochemical dehydrogenation In-plane heterostructure Water splitting

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Deterministic generation of nonclassical mechanical states in cavity optomechanics via reinforcement learning

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Physical Review A 2025年第5期111卷 053517-053517页

作者： Yu-Hong Liu Qing-Shou Tan Le-Man Kuang Jie-Qiao Liao Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan Province Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha Hunan 410081 China Hunan Research Center of the Basic Discipline for Quantum Effects and Quantum Technologies Hunan Normal University Changsha 410081 China Key Laboratory of Hunan Province on Information Photonics and Freespace Optical Communication College of Physics and Electronics Hunan Institute of Science and Technology Yueyang Hunan 414000 China Institute of Interdisciplinary Studies Hunan Normal University Changsha Hunan 410081 China

Nonclassical mechanical states, as vital quantum resources for exploring macroscopic quantum behavior, have wide applications in the study of the fundamental quantum mechanics and modern quantum technology. In this work, we propose a scheme for deterministically generating nonclassical mechanical states in cavity optomechanical systems. By working in the eigenrepresentation of the nonlinear optomechanical systems, we identify the carrier-wave resonance conditions and seek optimal driving pulses for state preparations. Concretely, we employ the reinforcement learning method to optimize the pulsed driving fields, effectively suppressing the undesired transitions induced by both the pulsed driving fields and dissipations. This approach enables the high-fidelity preparation of phononic Fock states and superposed Fock states in the single-resonator optomechanical systems, as well as two-mode entangled states in the two-resonator optomechanical systems. The statistical properties of the generated states are also examined. Our results create an opportunity for quantum state engineering in quantum optics and quantum information science via reinforcement learning.

关键词： Quantum optics

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Entanglement of two Jaynes-Cummings atoms in single-excitation space

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Communications in Theoretical Physics 2021年第2期73卷 52-58页

作者： Ya Yang Yan Liu Jing Lu Lan Zhou Key Laboratory of Low Dimensional Quantum Strncures and Quantum Control of Ministry of Education Department of Phlysics and Synergetic Innovation Center of Quantum Effects and ApplicationsKey Laboratory for Matter Microstructure and Function of Hunan ProvinceHunan Normal UniversityChangsha 410081China Collge of Physics and Electronic Engineering Hengyang Normal UniversityHengyang 421002China

We study the entanglement dynamics of two atoms coupled to their own Jaynes-Cummings cavities in single-excitation ***,we use concurrence to measure atomic entanglement,and consider the Bell-like states to be initial *** analysis suggests that collapse and revival take place in entanglement *** physical mechanism behind entanglement dynamics is periodic information and energy exchange between atoms and light *** the initial Bell-like states,evolutionary periodicity of the atomic entanglement can only be found if the ratio of the two atom-cavity coupling strengths is a rational ***,whether there is a time translation between two kinds of initial Bel-like state depends on odd versus even numbers of the coupling strength ratio.

关键词： cavity optomechanics Jaynes-Cummings cavities single excitation entanglement dynamics

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Chiral bound states in a staggered array of coupled resonators

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Chinese Physics B 2024年第2期33卷 124-130页

作者：金伍林李静卢竞龚志瑞周兰 Synergetic Innovation Center for Quantum Effects and Applications Key Laboratory for Matter Microstructure and Function of Hunan ProvinceKey Laboratory of Low-Dimensional Quantum Structures and Quantum Control of the Ministry of EducationSynergetic Innovation Center for Quantum Effects and ApplicationsInstitute of Interdisciplinary StudiesXiangjiang-Laboratory and Department of PhysicsHunan Normal UniversityChangsha 410081China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China

We study the chiral bound states in a coupled-resonator array with staggered hopping strengths,which interacts with a two-level small atom through a single coupling point or two adjacent *** addition to the two typical bound states found above and below the energy bands,this system presents an extraordinary chiral bound state located within the energy *** use the chirality to quantify the breaking of the mirror *** find that the chirality value undergoes continuous changes by tuning the coupling *** preferred direction of the chirality is controlled not only by the competition between the intracell and the intercell hoppings in the coupled-resonator array,but also by the coherence between the two coupling *** the case with one coupling point,the chirality values varies monotonously with difference between the intracell hopping and the intercell *** in the case with two coupling points,due to the coherence between the two coupling points the perfect chiral states can be obtained.

关键词： bound states two-level small atom coupled-resonator array chirality

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