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	1. Monogamy of quantum correlations in the one-dimensional anisotropic XY model
	XU Shuai,SONG Xueke,YE Liu
	Physics 17 April 2013
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	Abstract:In this paper, the witnesses of monogamy for some quantum correlation, including the geometric quantum discord, concurrence, entanglement of formation and entropy quantum discord, in the anisotropic spin-1/2 XY model with staggered Dzyaloshinskii-Moriya (DM) interaction have been investigated by employing the quantum renormalization-group method. We summarize the monogamy for different measures, and make an explicit comparison. Furthermore, through mathematical calculations and analysis, we observe that no matter how many the iteration of renormalization group is, the monogamy of the given states are always unaltered. Moreover, we give out a conclusion that the geometric quantum discord and concurrence of the given states obey the monogamy property while other quantum correlation measures for this model such as entanglement of formation and quantum discord violate it.
	TO cite this article:XU Shuai,SONG Xueke,YE Liu. Monogamy of quantum correlations in the one-dimensional anisotropic XY model[J].


	2. Implementation of quantum logic gates and cluster states for distant qubits
	LI Na,YE Liu
	Physics 04 April 2013
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	Abstract:We propose a scheme to implement the swap gate and the phase gate, in which N identical atoms are respectively trapped in N separated cavities connected by optical fibers. In addition, using the phase gate which we generate, we can realize an N-qubit cluster state. Our scheme is very helpful for realizing the transfer of the information in the quantum network and future scalable computing networks.
	TO cite this article:LI Na,YE Liu. Implementation of quantum logic gates and cluster states for distant qubits[OL].[ 4 April 2013] http://en.paper.edu.cn/en_releasepaper/content/4535863

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	3. Construction of a quantum repeater based on quantum-dot in an optical microcavity system
	Wang Chuan,CAO Cong,HE Lingyan
	Physics 22 January 2013
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	Abstract:In this paper, we investigate an efficient quantum repeater protocol based on quantum dots (QDs) and optical microcavity coupled systems. The proposed system can be used for long-distance quantum entanglement distribution, exploiting the interaction between single photons and QDs embedded in optical microcavities. We discuss the protocols for the entanglement generation and entanglement swapping modules with QDs in microcavity systems and generalize it to quantum repeater protocol. In the proposed system, the use of cavities leads to a high success probability for the generation of entanglement. By using current and near future technology, entanglement with a high fidelity can be achieved and robust quantum communication over long-distance channels is feasible.
	TO cite this article:Wang Chuan,CAO Cong,HE Lingyan. Construction of a quantum repeater based on quantum-dot in an optical microcavity system[OL].[22 January 2013] http://en.paper.edu.cn/en_releasepaper/content/4516954


	4. Strongly-coupled Josephson junction array for simulation of frustrated one-dimensional spin models
	DU Lianghui,ZHOU Xingxiang,HAN Yongjian,GUO Guangcan,Zhou Zhengwei
	Physics 13 August 2012
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	Abstract:This paper study the capacitance-coupled Josephson junction array beyond thesmall-coupling limit. When the scale of the system islarge, its Hamiltonian can be obtained without the small-couplingapproximation and the system can be used to simulate stronglyfrustrated one-dimensional Ising spin problems. To engineer thesystem Hamiltonian for an ideal theoretical model, we apply adynamical decoupling technique to eliminate undesirable couplings inthe system. Using a 6-site junction array as an example, numerical evaluation of the system shows that it exhibits importantcharacteristics of the frustrated spin model.
	TO cite this article:DU Lianghui,ZHOU Xingxiang,HAN Yongjian, et al. Strongly-coupled Josephson junction array for simulation of frustrated one-dimensional spin models[J].


	5. Phase-controlled light switching in a microwave-driven closed-loop atomic medium
	LI Jiahua,YU Rong,SI Liugang,ZHENG Anshou,YANG Xiaoxue
	Physics 19 March 2012
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	Abstract:We study the switching behavior in a three-level closed-loopatomic system driven coherently by a weak probe laser field, acontrol laser field and a microwave field. To describe thetransient behavior of the system, we go beyond the steady-stateapproximation and simultaneously solve the coupled Bloch-Maxwellequations for the atoms and the probe field on numerical grids asfunctions of space and time. The results show that thecontinuous-wave input probe field can be switched on and off whenthe relative phase of the applied field is periodically modulated.The proposed scheme may hold potential applications in the designof optical switching and optical storage devices.
	TO cite this article:LI Jiahua,YU Rong,SI Liugang, et al. Phase-controlled light switching in a microwave-driven closed-loop atomic medium[OL].[19 March 2012] http://en.paper.edu.cn/en_releasepaper/content/4472304


	6. Bright two-color tripartite entanglement with second harmonic generation
	Zhai Shuqin,Yang Rongguo,Liu Kui,Zhang Hailong,Zhang Junxiang,Gao jiangrui
	Physics 29 February 2012
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	Abstract:The bright two-color tripartite entanglement is investigated in the process of type II second harmonic generation (SHG) operating above threshold. The two pump fields and the second harmonic field are proved to be entangled, and the dependence of the entanglement degree on pump parameter and normalized frequency is also analyzed.
	TO cite this article:Zhai Shuqin,Yang Rongguo,Liu Kui, et al. Bright two-color tripartite entanglement with second harmonic generation[OL].[29 February 2012] http://en.paper.edu.cn/en_releasepaper/content/4469222


	7. Generation of multicolored tripartite entanglement by frequency doubling in a two-port resonator
	Yang Rongguo,Zhai Shuqin,Liu Kui,Zhang Junxiang,GAO Jiangrui
	Physics 29 February 2012
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	Abstract:Multicolored multipartite entanglement is of great importance in quantum communication and quantum information network. In this paper, we calculate the quantum fluctuations of the fundamental frequency pump beam and second harmonic beams in a two-port Frequency Doubling Resonator, and investigate the tripartite continuous-variable entanglement generated by this device for the first time. The quantum correlation among fundamental frequency pump beam and two harmonic beams is studied using a necessary and sufficient criterion for Gaussian entanglement states, the positivity under partial transposition (PPT). It is found that two color tripartite entanglement exists in a large range of pump intensity and analysis frequency.
	TO cite this article:Yang Rongguo,Zhai Shuqin,Liu Kui, et al. Generation of multicolored tripartite entanglement by frequency doubling in a two-port resonator[OL].[29 February 2012] http://en.paper.edu.cn/en_releasepaper/content/4469219


	8. Generation of squeezed TEM01 modes with periodically poled KTiOPO4 crystal
	YANG Rongguo,SUN Hengxin,ZHANG Junxiang,GAO Jiangrui
	Physics 29 February 2012
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	Abstract:Spatial quantum optics and quantum information based on the high order transverse mode are of importance for the super-resolution measurement beyond the quantum noise level. We demonstrated experimentally the transverse plane TEM01 Hermite-Gauss quantum squeezing. The squeezed TEM01 mode is generated in a degenerate optical parametric amplifier with the nonlinear crystal of periodically poled KTiOPO4. The level of 2.2dB squeezing is measured using a spatial balance homodyne detection system.
	TO cite this article:YANG Rongguo,SUN Hengxin,ZHANG Junxiang, et al. Generation of squeezed TEM01 modes with periodically poled KTiOPO4 crystal[OL].[29 February 2012] http://en.paper.edu.cn/en_releasepaper/content/4469213


	9. Exact relation of spin squeezing and phase coherence in a two-mode Bose-Einstein condensates
	ZHANG Yuanming,LI Xue,Wang Tenglong,Jin Guangri
	Physics 14 February 2012
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	Abstract:We investigate spin squeezing of a two-mode boson system with aJosephson coupling. An exact relation between the squeezing and thesingle-particle coherence is discovered, which provides an indirectway to measure the squeezing by readout the coherence in atomicinterference experiments. We prove explicitly that the squeezing isjust along the z axis, indicating the appearance ofnumber-squeezed state. Power laws of the strongest squeezing and theoptimal coupling with particle number N are obtained based upon awide range of numerical simulations.
	TO cite this article:ZHANG Yuanming,LI Xue,Wang Tenglong, et al. Exact relation of spin squeezing and phase coherence in a two-mode Bose-Einstein condensates[OL].[14 February 2012] http://en.paper.edu.cn/en_releasepaper/content/4466369


	10. Continuous variable quantum key distribution based on optical entangled states without signal modulation
	SU Xiaolong,Wang Wenzhe,WANG Yu,JIA Xiaojun,XIE Changde,PENG Kunchi
	Physics 05 March 2011
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	Abstract:In this paper, we present the first experimental demonstration on continuous variable quantum key distribution using determinant Einstein-Podolsky-Rosen entangled states of optical field. By means of the instantaneous measurements of the quantum fluctuations of optical modes respectively distributed at sender and receiver, the random bits of secret key are obtained without the need for signal modulation. The post-selection boundaries for the presented entanglement-based scheme against both Gaussian collective and individual attacks are theoretically concluded. The final secret key rates of 84 kbits/s and 3 kbits/s are completed under the collective attack for the transmission efficiency of 80% and 40%, respectively.
	TO cite this article:SU Xiaolong,Wang Wenzhe,WANG Yu, et al. Continuous variable quantum key distribution based on optical entangled states without signal modulation[OL].[ 5 March 2011] http://en.paper.edu.cn/en_releasepaper/content/4414447

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