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Science China(Physics,Mechanics & Astronomy) 2014年第12期57卷 2259-2265页

作者： liu yi min liu Rong Wan Department of Physics Shaoguan University

A potentially practical scheme is proposed to realize optical quantum simulation of artificial Abelian gauge field in a scalable architecture consisting of cold atomic ensembles with optical *** the present model,the collective excitations of cold atomic ensembles can be converted to the bosonic modes within the low-excitation limit,where the structure of two-dimension(2D)square plaquette enables the polaritons to move like a charged particle subjected to an external magnetic *** find that the energy spectrum of this hybrid system exhibits a shape of Hofstadter *** work provides a different perspective to the quantum simulation of condensed matter and many-body physics in the context of cavity quantum *** experimental feasibility are justified using the existing techniques.

关键词： gauge field quantum information processing cavity array

Generalized Quantum Two-Qutrit-State Splitting

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Communications in Theoretical Physics 2008年第10期50卷 873-878页

作者： YUAN Hao liu yi-min ZHANG Zhan-Jun School of Physics ＆ Material Science Anhui University Hefei 230039 China Department of Physics Shaoguan University Shaoguan 512005 China

A three-party scheme for splitting an arbitrary unknown two-qutrit state is proposed,where two non-maximally-entangled three-qutrit states are taken as the quantum channel among three *** the sender'shelp,if and only if both receivers collaborate together,they can securely share the quantum state in a probabilisticway by introducing an ancilla qutrit and performing appropriate unitary *** relation between the successprobability and coefficients characterizing the quantum channel is *** security of the present scheme is analyzedand ***,the generalization of the three-party scheme to more-party case is also sketched.

关键词： generalized quantum state splitting partially entangled state generalized Bell-state measurement single-qutrit projective measurement

Remote Preparation of Three-Particle GHZ Class States

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Communications in Theoretical Physics 2008年第2期49卷 359-364页

作者： liu yi-min WANG Zhang-yin liu Jun ZHANG Zhan-Jun Department of Physics Shaoguan University Shaoguan 512005 China Key Laboratory of Optoelectronic Information Acquisition ＆ Manipulation of ministry of Education of China School of Physics ＆ Material Science Anhui University Hefei 230039 China

We propose a remote state preparation （RSP） scheme of three-particle Greenberger Horne-Zeilinger （GHZ） class states, where quantum channels are composed of two maximally entangled states. With the aid of forward classical bits, the preparation of the original state can be successfully realized with the probability 1/2, the necessary classical communication cost is 0.5 bit on average. If the state to be prepared belongs to some special states, the success probability of preparation can achieve 1 after consuming one extra bit on average. We then generalize this scheme to the case that the quantum channels consist of two non-maximally entangled states.

关键词： remote state preparation entangled states classical communication cost two-qubit projective measurement unitary operation

Revisiting Controlled Quantum Secure Direct Communication Using a Non-symmetric Quantum Channel with Quantum Superdense Coding

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Communications in Theoretical Physics 2008年第4期49卷 887-890页

作者： liu Jun liu yi-min XIA Yan ZHANG Zhan-Jun Key Laboratory of Optoelectronic Information Acquisition ＆ Manipulation of ministry of Education of China School of Physics ＆ Material Science Anhui University Hefei 230039 China Department of Physics Shaoguan University Shaoguan 512005 China School of Physic and Optoelectronic Dalian University of Technology Dalian 116024 China

Recently Xia and Song [Phys. Lett. A 364 （2007） 117] have proposed a controlled quantum secure direct communication （CQSDC） protocol. They claimed that in their protocol only with the help of the controller Charlie, the receiver Alice can successfully extract the secret message from the sender Bob. In this letter, first we will show that within their protocol the controller Charlie＇s role could have been excluded if it were not for their unreasonable design. We then revise the Xia-Song CQSDC protocol such that its original advantages are reta/ned and the CQSDC can be really realized.

关键词： quantum secure direct communication quantum superdense coding non-symmetric quantumchannel

Research on Improved Dark Channel Dehazing Algorithm Based on Parameter Differentiating Sky Area

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Research on Improved Dark Channel Dehazing Algorithm Based o...

Classical Communication and Entanglement Cost in Preparing a Class of Multi-qubit States

第32届中国控制与决策会议

作者： liu Tao liu yi-min School of information Science and Engineering Wuhan University of Science and Technology

ISBN: (数字)9781728158556

ISBN: (纸本)9781728158563

For the dark channel prior defogging algorithm, there are problems such as sky region distortion and darkening of the restored image. An optimization method based on parameter to distinguish between sky and non-sky regions is discussed. First, correct the rough transmittance estimation method for the bright area of the sky. Then, discuss the effectiveness of the distinction between the sky and the sky region by and tolerance parameter K. Estimate the rough transmittance of the sky and non-sky regions separately. And it is refined by adaptive median filtering and guided filtering. Finally, the atmospheric light values estimated by the quadtree subspace partitioning method and the variogram are respectively substituted into the atmospheric scattering model to compare the advantages and disadvantages of the restored image effect. The Experiments prove that the algorithm in this paper has the advantages of strong robustness, can cope with complex scenes, and maintain the normal color of the sky area after defogging, especially compared with the existing methods. Improved the defogging ability and visual effect.

关键词： Image defogging Dark channel prior Transmittance Sky region distortion

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Communications in Theoretical Physics 2008年第3期49卷 631-634页

作者： PAN Gui-Xia liu yi-min ZHANG Zhan-Jun Department of Mathematics and Physics Anhui University of Science and Technology Huainan 232001 China Department of Physics Shaoguan University Shaoguan 512005 China Key Laboratory of Optoelectronic Information Acquisition ＆ Manipulation of ministry of Education of China School of Physics ＆ Material Science Anhui University Hefei 230039 China

Recently, several similar protocols [J. Opt. B 4 （2002） 380; Phys. Lett. A 316 （2003） 159; Phys. Lett. A 355 （2006） 285; Phys. Lett. A 336 （2005） 317] for remotely preparing a class of multi-qubit states （i.e, α[0...0〉＋β[1... 1〉） were proposed, respectively. In this paper, by applying the controlled-not （CNOT） gate, a new simple protocol is proposed for remotely preparing such class of states. Compared to the previous protocols, both classical communication cost and required quantum entanglement in our protocol are remarkably reduced. Moreover, the difficulty of identifying some quantum states in our protocol is also degraded. Hence our protocol is more economical and feasible.

关键词： remote state preparation quantum entanglement classical communication cost projective measurement local unitary operation

Many-Agent Controlled Teleportation of Multi-qubit Quantum Information via Quantum Entanglement Swapping

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Communications in Theoretical Physics 2005年第5X期44卷 847-850页

作者： ZHANG Zhan-Jun liu yi-min MAN Zhong-Xiao School of Physics & Material Science Anhui University Hefei 230039 China Department of Physics Shaoguan University Shaoguan 512005 China Wuhan Institute of Physics and Mathematics the Chinese Academy of Sciences Wuhan 430071 China

We present a method to teleport multi-qubit quantum information in an easy way from a sender to a receiver via the control of many agents in a network. Only when all the agents collaborate with the quantum information receiver can the unknown states in the sender＇s qubits be fully reconstructed in the receiver＇s qubits. In our method, agents＇s control parameters are obtained via quantum entanglement swapping. As the realization of the many-agent controlled teleportation is concerned, compared to the recent method [G.P. Yang, et al., Phys. Rev. A 70 （2004） 022329], our present method considerably reduces the preparation difficulty of initial states and the identification difficulty of entangled states, moreover, it does not need local Hadamard operations and it is more feasible in technology.

关键词： quantum teleportation quantum information quantum entanglement swapping

Statistical Downscaling of FGOALS-s2 Projected Precipitation in Eastern China

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Atmospheric and Oceanic Science Letters 2014年第5期7卷 388-394页

作者： DAI yi-Feng liu yi-min JIN Ji-ming The National Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG) Institute of Atmospheric Physics Chinese Academy of Sciences University of Chinese Academy of Sciences Tongji University Zhejiang College Utah State University UT 84341 USA

A statistical regression downscaling method was used to project future changes in precipitation over eastern China based on Phase 5 of the Coupled Model Intercomparison Project （CMIPS） the Representative Concentration Pathway （RCP） scenarios simulated by the second spectral version of the Flexible Global Ocean- Atmosphere-Land System （FGOALS-s2） model. Our val- idation results show that the downscaled time series agree well with the present observed precipitation in terms of both the annual mean and the seasonal cycle. The regres- sion models built from the historical data are then used to generate future projections. The results show that the en- hanced land-sea thermal contrast strengthens both the subtropical anticyclone over the western Pacific and the east Asian summer monsoon flow under both RCPs. However, the trend of precipitation in response to warming over the 21 st century are different across eastern Chi- na under different RCPs. The area to the north of 32°N is likely to experience an increase in annual mean precipitation, while for the area between 23°N and 32°N mean precipitation is projected to decrease slightly over this century under RCP8.5. The change difference between scenarios mainly exists in the middle and late century. The land-sea thermal contrast and the associated east Asian summer monsoon flow are stronger, such that precipitation increases more, at higher latitudes under RCP8.5 compared to under RCP4.5. For the region south of 32°N, rainfall is projected to increase slightly under RCP4.5 but decrease under RCP8.5 in the late century. At the high resolution of 5 km, our statistically downscaled results for projected precipitation can be used to force hydrological models to project hydrological processes, which will be of great benefit to regional water planning and management.

关键词： regional precipitation projection statistical downscalin eastern China

Assisted Cloning and Orthogonal Complementing of an Arbitrary Unknown Two-Qubit Entangled State

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Communications in Theoretical Physics 2006年第5X期46卷 849-852页

作者： FANG ming liu yi-min liu Jun SHI Shou-Hua ZHANG Zhan-Jun School of Physics & Material Science Anhui University Hefei 230039 China Department of Physics Shaoguan University Shaoguan 512005 China The State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics the Chinese Academy of Sciences Wuhan 430071 China

Based on A.K. Pati＇s original idea [Phys. Rev. A 61 （2000） 022308] on single-qubit-state-assisted clone, very recently Zhan has proposed two assisted quantum cloning protocols of a special class of unknown two-qubit entangled states [Phys. Lett. A 336 （2005） 317]. In this paper we further generalize Zhan＇s protocols such that an arbitrary unknown two-qubit entangled state can be treated.

关键词： quantum cloning arbitrary two-qubit entangled state two-qubit projective measurement

Controlled Remote State Preparation

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Communications in Theoretical Physics 2009年第8期52卷 235-240页

作者： WANG Zhang-yin liu yi-min ZUO Xue-Qin ZHANG Zhan-Jun School of Physics ＆ Material Science Anhui University Hefei 230039 China Department of Physics Shaoguan University Shaoguan 512005 China

We present a scheme for remotely preparing a state via the controls of many agents in a *** thescheme,the agents' controls are achieved by utilizing quantum key ***,the original state can berestored by the receiver wi... 详细信息

关键词： controlled remote state preparation quantum key distribution single-qubit von Neumann orthogonal measurement controlled-NOT gate