作者机构：
[Tang, Shi-qing; Liu, Han] Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421002, Peoples R China.;[Tang, Shi-qing; Liu, Han] Hengyang Normal Univ, Hunan Prov Key Lab Intelligent Informat Proc & App, Hengyang 421002, Peoples R China.;[Li, Song-song] Nanchang Normal Univ, Coll Phys & Elect Informat, Nanchang 330032, Peoples R China.;[Guo, You-neng] Changsha Univ, Dept Elect & Commun Engn, Changsha 410022, Hunan, Peoples R China.
通讯机构：
[You-neng Guo] D;Department of Electronic and Communication Engineering, Changsha University, Changsha, Hunan 410022, People's Republic of China
关键词：
entropic uncertainty relation;non-Hermitian system;exceptional point
摘要：
<jats:title>Abstract</jats:title>
<jats:p>Under the large detuning conditions, a three-level atom in Λ-type configuration reduced to an effective two-level system has been investigated by Shahriar and Hemmer (1990 <jats:italic>Phys. Rev. Lett.</jats:italic>
<jats:bold>65</jats:bold> 1865). By introducing unbalanced gain and loss, we in detail investigate the behaviors of entropic uncertainty relation (EUR) in an effective two-level non-Hermitian system. Compared with the dynamics governed by a Hermitian Hamiltonian, we find the EUR in non-Hermitian system is well defined based on the exceptional points of the effective non-Hermitian system, and displays two distinct behaviors. More specifically, when systems possess an exceptional point above which the EUR undergoes an oscillatory behavior, while below which the EUR increases asymptotically to a finite constant value.</jats:p>
作者机构：
[Jiang, Xi; Zhang, Ziqiu; Tang, Shiqing] Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421002, Peoples R China.;[Tang, Shiqing] Hunan Normal Univ, Key Lab Low Dimens Quantum Struct & Quantum Contr, Minist Educ, Changsha 410081, Peoples R China.
通讯机构：
[Shiqing Tang] K;Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Hunan Normal University, Changsha 410081, China<&wdkj&>College of Physics and Electronic Engineering, Hengyang Normal University, Hengyang 421002, China<&wdkj&>Author to whom correspondence should be addressed.
摘要：
The cross fusion of quantum mechanics and information science forms quantum information science. Quantum logic gates and quantum entanglement are very important building blocks in quantum information processing. In this paper, we propose one-step schemes for realizing quantum swap gates and generating two-mode entangled coherent states via circuit QED. In our scheme, due to the adiabatic elimination of the excited state of the qutrit under the condition of large detuning, the decoherence of the spontaneous emission of the qutrit can be ignored. The fidelity of the quantum swap gate remains at a very high level. In addition, we also explore the nonclassical properties of two-mode entangled coherent states prepared in our scheme by addressing the second-order correlation function and intermodal squeezing. In particular, two classes of entangled coherent states demonstrate distinct entanglement and nonclassical behavior.
作者机构：
[Tang, Shiqing] Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421002, Peoples R China.;[Li, Dongxiao; Yang, Chong] Shenyang Normal Univ, Coll Phys Sci & Technol, Shenyang 110034, Peoples R China.;[Shao, Xiaoqiang] Northeast Normal Univ, Ctr Quantum Sci & Sch Phys, Changchun 130024, Peoples R China.;[Shao, Xiaoqiang] Northeast Normal Univ, Ctr Adv Optoelect Funct Mat Res, Minist Educ, Changchun 130024, Peoples R China.;[Shao, Xiaoqiang] Northeast Normal Univ, Minist Educ, Key Lab UV Light Emitting Mat & Technol, Changchun 130024, Peoples R China.
通讯机构：
[Dongxiao Li; Xiaoqiang Shao] A;Authors to whom correspondence should be addressed.<&wdkj&>College of Physics Science and Technology, Shenyang Normal University, Shenyang 110034, China<&wdkj&>Authors to whom correspondence should be addressed.<&wdkj&>Center for Quantum Sciences and School of Physics, Northeast Normal University, Changchun 130024, China<&wdkj&>Center for Advanced Optoelectronic Functional Materials Research, and Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun 130024, China
作者机构：
[Lu, Wangjun; Zhai, Cuilu] Hunan Inst Engn, Dept Maths & Phys, Xiangtan 411104, Peoples R China.;[Lu, Wangjun] Zhejiang Univ, Zhejiang Inst Modern Phys, Dept Phys, Hangzhou 310027, Peoples R China.;[Tang, Shiqing] Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421002, Peoples R China.
通讯机构：
[Shiqing Tang] C;College of Physics and Electronic Engineering, Hengyang Normal University, Hengyang 421002, China<&wdkj&>Author to whom correspondence should be addressed.
关键词：
correlation functions;indirect measurement;two-level atoms;Jaynes–Cummings model;Tavis–Cummings model
期刊：
Proceedings of SPIE - The International Society for Optical Engineering,2021年11905 ISSN：1996-756X
通讯作者：
Tang, S.Q.(sqtang@hynu.edu.cn)
作者机构：
[Tang, S.Q.; Luo, S.] College of Physics and Electronic Engineering, Hengyang Normal University, Hengyang;421002, China;[Xu, J.L.] Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control, Ministry of Education, Hunan Normal University, Changsha;410081, China;[Tang, S.Q.; Luo, S.] 421002, China
作者机构：
[Wang, Haibin; He, Xiongying; Shi, Yimin; Zhou, Zheng] Hunan Inst Technol, Dept Phys, Hengyang 421002, Peoples R China.;[Tang, Shiqing] Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421002, Peoples R China.;[Deng, Haiming] Xiangnan Univ, Sch Elect Informat & Elect Engn, Chenzhou 423000, Peoples R China.;[Zhong, Honghua] Cent South Univ Forestry & Technol, Inst Math & Phys, Changsha 410004, Peoples R China.
通讯机构：
[Honghua Zhong] I;Institute of Mathematics and Physics, Central South University of Forestry and Technology, Changsha 410004, China
关键词：
Bose-Einstein condensates;Quantum droplets;Three-body recombination loss
摘要：
We investigate the dynamics of dissipative quantum droplets (QDs) forming in one-dimensional binary Bose gases subjected to three-body recombination loss and linear gain in perturbed optical lattices. We demonstrate by a perturbation procedure that an alimentation of atoms from an external feeding source to the QDs may lead to the formation of dynamically-stabilized dissipation-controlled QDs. It is worth noting that such dissipation-controlled QDs are independent of the initial condensation norm and are solely determined by the gain and loss parameters. We further study the dynamics of the dissipation controlled QDs with varying norm due to the gain and loss mechanisms in relatively weak optical lattices. It is found that the stationary dissipative QDs can be accelerated and either continuously travel across the potential barriers or eventually perform trapped oscillations in different lattice sites by selecting the appropriate gain and loss parameters. Finally, we deal with the collision between the dissipative QDs. It is revealed that two slowly moving dissipative QDs with varying norm may merge or collide quasi-elastically depending on their initial separation, which is quite different from QDs in the conservative systems. Specially, we explore the collision dynamics of the dissipative QDs in a single lattice site provided that the spatial period of optical lattices is large enough. The in-phase interaction between the dissipative QDs tends to merge, while the out-of-phase interaction displays quasi-elastic collision. (c) 2021 Elsevier Ltd. All rights reserved.
期刊：
Journal of Low Temperature Physics,2019年195(1-2):60-71 ISSN：0022-2291
通讯作者：
Tang, S. Q.
作者机构：
[Liu, L.; Tang, S. Q.; Yuan, J. B.] Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421002, Peoples R China.;[Tang, S. Q.; Yuan, J. B.] Hunan Normal Univ, Key Lab Low Dimens Quantum Struct & Quantum Contr, Minist Educ, Changsha 410081, Hunan, Peoples R China.;[Tang, S. Q.; Yuan, J. B.] Hunan Normal Univ, Dept Phys, Changsha 410081, Hunan, Peoples R China.
通讯机构：
[Tang, S. Q.] H;Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421002, Peoples R China.;Hunan Normal Univ, Key Lab Low Dimens Quantum Struct & Quantum Contr, Minist Educ, Changsha 410081, Hunan, Peoples R China.;Hunan Normal Univ, Dept Phys, Changsha 410081, Hunan, Peoples R China.
关键词：
Photon transport;Three-level atom;Router
摘要：
Photon quantum routing is one of the key elements of the quantum information network and integrated optical devices. In this paper, we theoretically investigate the single-photon transport in an intersection coupled resonant waveguide (CRW), called the T-bulge structure, in which the
$$N\hbox {th}$$
cavity of a semi-infinite CRW couples with one point of an infinite CRW via a cascaded three-level atom. By using the discrete coordinates approach, transmission and reflection amplitudes of the propagating single photon in the waveguide are analytically obtained. Two cases that a single photon is incident from the infinite CRW and from semi-infinite CRW are considered, respectively. Based on the theoretical framework, we show that the quantum router function can be realized by directing a single photon incidenting from the semi-infinite CRW to the infinite CRW with the unity probabilities, and the probability of routing single photons from infinite CRW to semi-infinite CRW could reach 0.5. Our study provides a full quantum control scheme of single-photon scattering in T-bulge structure coupled cavity array waveguide.
关键词：
Hybrid Toffoli gate;Dipole-induced transparency;Cavity-waveguide system
摘要：
We propose two feasible schemes for realizing hybrid Toffoli gates with dipole-induced transparency (DIT) effect in series and parallel cavity-waveguide systems. The gate operations are accomplished by encoding information on flying photon and dipole emitter evanescently coupled to the microcavity, and the spatial as well as polarization states of photon will be flipped conditional on the quantum states of dipole emitters. The schemes could be physically realized in one step and straightforwardly extended to realize the N-qubit Toffoli gate, which greatly simplifies the experimental implementation of Toffoli gate and promises a much higher fidelity compared to those based on elementary gate decomposition. Benefiting from DIT effect, the schemes can be achievable without requirement of strong coupling condition of cavity-waveguide system, and they are insensitive to experimental noises, imperfections and the phase delay of adjacent microcavities, which may be feasible with present accessible technology.
作者机构：
[Yuan, Ji-Bing; Zhang, Deng-Yu; Tang, Shi-Qing] Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421008, Peoples R China.;[Yuan, Ji-Bing; Zhang, Deng-Yu; Tang, Shi-Qing] Hengyang Normal Univ, Hunan Prov Key Lab Intelligent Informat Proc & Ap, Hengyang 421008, Peoples R China.;[Peng, Zhao-Hui] Hunan Univ Sci & Technol, Inst Modern Phys, Xiangtan 411201, Peoples R China.;[Peng, Zhao-Hui] Hunan Univ Sci & Technol, Dept Phys, Xiangtan 411201, Peoples R China.;[Yuan, Ji-Bing; Tang, Shi-Qing] Hunan Normal Univ, Key Lab Low Dimens Quantum Struct, Changsha 410081, Hunan, Peoples R China.
通讯机构：
[Tang, Shi-Qing] H;Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421008, Peoples R China.;Hengyang Normal Univ, Hunan Prov Key Lab Intelligent Informat Proc & Ap, Hengyang 421008, Peoples R China.;Hunan Normal Univ, Key Lab Low Dimens Quantum Struct, Changsha 410081, Hunan, Peoples R China.;Hunan Normal Univ, Minist Educ, Dept Phys, Quantum Control, Changsha 410081, Hunan, Peoples R China.
关键词：
DIT;TRANSPARENCY;PHOTONIC;MOLECULE;EMITTER
摘要：
We theoretically investigate the transparency effect with a hybrid system composed of a photonic molecule and dipole emitter. It is shown that the transparency effect incorporates both the coupled resonator-induced transparency (CRIT) effect and the dipole-induced transparency (DIT) effect. It is found that the superposed transparency windows are consistently narrower than the CRIT and DIT transparency windows. Benefiting from the superposed transparency effect, the photonic Faraday rotation effect could be realized in the photonic molecule system, which is useful for entanglement generation and quantum information processing.
期刊：
Results in Physics,2018年9:215-217 ISSN：2211-3797
通讯作者：
Tang, Shiqing
作者机构：
[Dai, Zhiping; Tang, Shiqing; Ling, Xiaohui] Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421002, Peoples R China.
通讯机构：
[Tang, Shiqing] H;Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421002, Peoples R China.
关键词：
Hollow Gaussian beam;Strongly nonlocal media;Propagation property;Off-waist incident case
摘要：
In this paper, the propagation properties of hollow Gaussian beams (HGBs) are discussed in detail when they are off-waist incident in strongly nonlocal media. A set of mathematic expressions are given to describe the evolutions of the beam intensity, the beam width, and the real beam radius. Numerical simulations are carried out to illustrate these propagation properties depended on the off-waist incidence. It is found that a HGB always periodically transforms its transverse patterns during propagation. Accordingly, the beam width and the real beam radius are also periodic during propagation.
通讯机构：
[Wang, Xinwen] H;Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421002, Peoples R China.;Hengyang Normal Univ, Hunan Prov Key Lab Intelligent Informat Proc & Ap, Hengyang 421002, Peoples R China.;Hunan Normal Univ, Key Lab Low Dimens Quantum Struct & Quantum Contr, Minist Educ, Changsha 410081, Hunan, Peoples R China.
关键词：
One-step distillation;GHZ-type states;Local unitary equivalence;X states
摘要：
Entanglement distillation plays a very important role in quantum information science. Distillation of high-purity Greenberger–Horne–Zeilinger (GHZ) states has been widely studied. We here show that a pure GHZ-type entangled state or its local unitary (LU)-equivalent state could be extracted from two copies of a particular multipartite mixed state (e.g., an X state) in a single step. Such one-step distillation schemes for LU-equivalent states are expected to shed light on mixed-state manipulation and purification, as well as establish a link between entanglement classification and distillation.
期刊：
Journal of Russian Laser Research,2017年38(3):241-248 ISSN：1071-2836
通讯作者：
Yang, Zhenjun
作者机构：
[Dai, Zhiping; Tang, Shiqing] Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421002, Peoples R China.;[Yang, Zhenjun; Li, Xingliang; Zhang, Shumin] Hebei Normal Univ, Dept Phys, Shijiazhuang 050024, Peoples R China.;[Yang, Zhenjun; Li, Xingliang; Zhang, Shumin] Hebei Normal Univ, Hebei Adv Thin Film Lab, Shijiazhuang 050024, Peoples R China.;[Yang, Zhenfeng] Hebei Univ Sci & Technol, Dept Informat Management, Shijiazhuang 050018, Peoples R China.
通讯机构：
[Yang, Zhenjun] H;Hebei Normal Univ, Dept Phys, Shijiazhuang 050024, Peoples R China.;Hebei Normal Univ, Hebei Adv Thin Film Lab, Shijiazhuang 050024, Peoples R China.
摘要：
The nonlocal nonlinear Schrödinger equation (NNLSE) describes the propagation dynamics of optical beams in nonlinear media with a spatial nonlocal response. Based on NNLSE, we obtain the generalized sine hollow solitons and breathers and show that the transverse intensity evolutions of them are always periodical. However, if the incident power takes a critical value, the beam width can remain invariant during the propagation, just like the solitons. Otherwise, the beam width varies periodically, just like the breathers. We investigate the evolution characteristics for both cases analytically and numerically in detail.
