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.
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：
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.
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.
作者机构：
[Yuan, Ji-Bing; Wang, Xin-Wen; Tang, Shi-Qing; Zhang, Deng -Yu] Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421002, Peoples R China.;[Wang, Xin-Wen] Hunan Normal Univ, Key Lab Low Dimens Quantum Struct, Changsha 410081, Peoples R China.;[Wang, Xin-Wen] Hunan Normal Univ, Quantum Control Minist Educ, Changsha 410081, Peoples R China.;[Wang, Xin-Wen] Hunan Normal Univ, Synerget Innovat Ctr Quantum Effects & Applicat, Changsha 410081, Peoples R China.;[Yuan, Ji-Bing] Inst Theoret Phys, CAB Key Lab Theoret Phys, Beijing 100190, Peoples R China.
通讯机构：
[Wang, Xin-Wen] H;Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421002, Peoples R China.
关键词：
Entanglement purification;Non-GHZ-diagonal states;Non-asymptotic way;Perfect output states
摘要：
It has been shown that a nearly pure Greenberger-Horne-Zeilinger (GHZ) state could be distilled from a large (even infinite) number of GHZ-diagonal states that can be obtained by depolarizing general multipartite mixed states (non-GHZ-diagonal states) through sequences of (probabilistic) local operations and classical communications. We here demonstrate that perfect GHZ states can be extracted, with certain probabilities, from two copies of non-GHZ-diagonal mixed states when some conditions are satisfied. This result implies that it is not necessary to depolarize these entangled mixed states to the GHZ-diagonal type, and that they are better than GHZ-diagonal states for distillation of pure GHZ states. We find a wide class of multipartite entangled mixed states that fulfill the requirements. Moreover, we display that the obtained result can be applied to practical noisy environments, e.g., amplitude-damping channels. Our findings provide an important complementarity to conventional GHZ-state distillation protocols (designed for GHZ-diagonal states) in theory, as well as having practical applications.
摘要：
We investigate the effect of the interplay between the interatomic interaction and impurity on dynamic localization for two interacting bosons held in driven one-dimensional lattices with an impurity. We find that the interplay of the interatomic interaction and impurity can induce second-order tunneling under the dynamic localization condition. In the resonant regime, where the impurity potential is equal to a multiple of the driving frequency, two bosons form a stable bound pair and the dominant tunneling of the doublon in the paired state is a second-order process. In the non-resonant regime, the tunneling dynamics of the single boson in the unpaired state can also be a second-order process between the two nearest-neighbor sites of the impurity with the negligible impurity site population, and the other boson is localized in the initial site all the time. Our results provide a promising approach for controlling transport of realistic systems.
摘要：
We study temperature effects on non-Markovian dynamics in a model of an atomic impurity qubit immersed in a quasi-two-dimensional dipolar Bose-Einstein condensate , which can be described as a pure dephasing spin-boson model. We use the measure proposed by Breuer et al. (Phys Rev Lett 103:210401, 2009) to characterize non-Markovianity of the quantum process and find for larger relative dipole-dipole interaction, properly low temperature can induce the non-Markovianity enhancement. We give an explanation of the non-Markovianity enhancement that raising temperature can increase the sharpness of the temperature-dependent environmental spectral density.
作者机构：
[Liu, B.; Shao, X. Q.; Zhao, Y. J.; Ji, Y. Q.] Northeast Normal Univ, Ctr Quantum Sci, Changchun 130024, Jilin, Peoples R China.;[Liu, B.; Shao, X. Q.; Zhao, Y. J.; Ji, Y. Q.] Northeast Normal Univ, Sch Phys, Changchun 130024, Jilin, Peoples R China.;[Liu, B.; Shao, X. Q.; Zhao, Y. J.; Ji, Y. Q.] Northeast Normal Univ, Ctr Adv Optoelect Funct Mat Res, Minist Educ, Changchun 130024, Jilin, Peoples R China.;[Liu, B.; Shao, X. Q.; Zhao, Y. J.; Ji, Y. Q.] Northeast Normal Univ, Key Lab UV Light Emitting Mat & Technol, Minist Educ, Changchun 130024, Jilin, Peoples R China.;[Tang, S. Q.] Hengyang Normal Univ, Dept Phys & Elect Informat Sci, Hengyang 421008, Peoples R China.
通讯机构：
[Shao, X. Q.] N;[Tang, S. Q.] H;Northeast Normal Univ, Ctr Quantum Sci, Changchun 130024, Jilin, Peoples R China.;Northeast Normal Univ, Sch Phys, Changchun 130024, Jilin, Peoples R China.;Northeast Normal Univ, Ctr Adv Optoelect Funct Mat Res, Minist Educ, Changchun 130024, Jilin, Peoples R China.
