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.
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.
摘要：
<jats:title>Abstract</jats:title><jats:p>We propose a mechanism of ground-state antiblockade of Rydberg atoms, which is then exploited to prepare two-atom entangled state via three different kinds of pulses. First we use the pulses in the form of sin<jats:sup>2</jats:sup> and cos<jats:sup>2</jats:sup> functions and obtain a maximally entangled state at an accurate interaction time. Then the method of stimulated Raman adiabatic passage (STIRAP) is adopted for the entanglement generation, which is immune to the fluctuations of revelent parameters but requires a long time. Finally we capitalize the advantages of the former two methods and employ shortcuts to adiabatic passage (STAP) to generate the maximal entanglement. The strictly numerical simulation reveals that the current scheme is robust against spontaneous emission of atoms due to the virtual excitation of Rydberg states, and all of the above methods favor a high fidelity with the present experimental technology.</jats:p>
