A quantum secure direct intercommunication scheme is proposed to exchange directly the communicators'secret messages by making use of swapping entanglement of Bell states.It has great capacity to distribute the se...A quantum secure direct intercommunication scheme is proposed to exchange directly the communicators'secret messages by making use of swapping entanglement of Bell states.It has great capacity to distribute the secretmessages since these messages have been imposed on high-dimensional Bell states via the local unitary operations withsuperdense coding.The security is ensured by the secure transmission of the travel sequences and the application ofentanglement swapping.展开更多
A multi-sender-controlled quantum teleportation scheme is proposed to teleport several secret quan- tum states from different senders to a distance receiver based on only one Einstein-Podolsky-Rosen (EPR) pair with co...A multi-sender-controlled quantum teleportation scheme is proposed to teleport several secret quan- tum states from different senders to a distance receiver based on only one Einstein-Podolsky-Rosen (EPR) pair with controlled-NOT (CNOT) gates.In the present scheme,several secret single-qubit quantum states are encoded into a multi-qubit entangled quantum state.Two communication modes,i.e.,the detecting mode and the message mode,are employed so that the eavesdropping can be detected easily and the teleported message may be recovered efficiently.It has an advantage over teleporting several different quantum states for one scheme run with more efficiency than the previous quantum teleportation schemes.展开更多
The self-generated magnetic field induced by an ultraintense short laser pulse propagating in a uniform underdense plasma is investigated. The magnetic fields are strong and associated with the plasma wave wake field....The self-generated magnetic field induced by an ultraintense short laser pulse propagating in a uniform underdense plasma is investigated. The magnetic fields are strong and associated with the plasma wave wake field. Some properties of dc magnetic field in two extreme laser pulse regime are described.展开更多
A series of coupling equations for the relativistic coherent harmonic generation is derived taking account of the coupling effect among the harmonic contents and plasmas wave.Using these equations,the growth and satuT...A series of coupling equations for the relativistic coherent harmonic generation is derived taking account of the coupling effect among the harmonic contents and plasmas wave.Using these equations,the growth and satuTaiion of amplitude of the third harmonic wave is investigated.Results show that the coupling effect induces the saturation of harmonics,which is identical with ones of the Lagrangian description.展开更多
The security,efficiency,transmission distance and error rate are important parameters of a quantum key distribution scheme.In this article,the former two parameters are focused on.To reach high efficiency,an unsymmetr...The security,efficiency,transmission distance and error rate are important parameters of a quantum key distribution scheme.In this article,the former two parameters are focused on.To reach high efficiency,an unsymmetrical quantum key distribution scheme that employs Greenberger-Horne-Zeilinger(GHZ) triplet states and dense coding mechanism is proposed,in which a GHZ triplet state can be used to share two bits of classical information.The proposed scheme can be employed in a noisy or lossy quantum channel.In addition,a general approach to security analysis against general individual attacks is presented.展开更多
基金The project supported by National Natural Science Foundation of China under Grant Nos.60472018 and 60573127partly supported by the Postdoctoral Science Foundation of Central South University
文摘利用 stabilizer 量代码的编码进程[[n， k， d ]] ，一个确定的量通讯计划，在哪个 n - 1 个光子在双向隧道向前并且向后被散布，被建议与无条件的安全播送秘密消息。现在的计划能被实现散布秘密的量(或古典) 自从利用代码为每计划跑编码 k-qubit 消息，在有瑕疵的量隧道与大能力发送消息。
基金National Natural Science Foundation of China under Grant Nos.60472018,60773085,and 60773012National 863 Project under Grant No.2006AA01Z255+2 种基金the Natural Science Foundation of Hunan Province under Grant No.07JJ3128the Postdoctoral Science Foundation of China under Grant No.20070420184Science and Technology Project of Hunan Province under Grant No.2008RS4016
文摘A quantum secure direct intercommunication scheme is proposed to exchange directly the communicators'secret messages by making use of swapping entanglement of Bell states.It has great capacity to distribute the secretmessages since these messages have been imposed on high-dimensional Bell states via the local unitary operations withsuperdense coding.The security is ensured by the secure transmission of the travel sequences and the application ofentanglement swapping.
基金supported by National Natural Science Foundation of China under Grant Nos.60472018,60773085,and 60773012Natural Science Foundation of Hunan Province under Grant No.07JJ3128+1 种基金Postdoctoral Science Foundation of China under Grant No.20070420184in part by Ministry of Information and Communication (MIC) under the IT Foreign Specialist Inviting Program (ITFSIP) supervised by IIFA and ITIC supervised by IITA,Korea Research Foundation KRF-2007-521-D00300,and C1012-0001
文摘A multi-sender-controlled quantum teleportation scheme is proposed to teleport several secret quan- tum states from different senders to a distance receiver based on only one Einstein-Podolsky-Rosen (EPR) pair with controlled-NOT (CNOT) gates.In the present scheme,several secret single-qubit quantum states are encoded into a multi-qubit entangled quantum state.Two communication modes,i.e.,the detecting mode and the message mode,are employed so that the eavesdropping can be detected easily and the teleported message may be recovered efficiently.It has an advantage over teleporting several different quantum states for one scheme run with more efficiency than the previous quantum teleportation schemes.
基金the National Natural Science Foundation of China.
文摘The self-generated magnetic field induced by an ultraintense short laser pulse propagating in a uniform underdense plasma is investigated. The magnetic fields are strong and associated with the plasma wave wake field. Some properties of dc magnetic field in two extreme laser pulse regime are described.
基金Supported by the National Natural Science Foundation of China。
文摘A series of coupling equations for the relativistic coherent harmonic generation is derived taking account of the coupling effect among the harmonic contents and plasmas wave.Using these equations,the growth and satuTaiion of amplitude of the third harmonic wave is investigated.Results show that the coupling effect induces the saturation of harmonics,which is identical with ones of the Lagrangian description.
基金supported by the National Natural Science Foundation of China(60773085,10647133)the Natural Science Foundation of Jiangxi Province(2007GQS1906)+3 种基金the Research Foundation of the Education Department of Jiangxi Province([2007]22)the Key Project in the 11th Five-Year Plan on Education Science of Jiangxi Province(07ZD017)the Innovation Project of Jiangxi Graduate Education(YC07A033)the Scientific Research Starting Foundation for the Recruit Talent of Nanchang University of China
文摘The security,efficiency,transmission distance and error rate are important parameters of a quantum key distribution scheme.In this article,the former two parameters are focused on.To reach high efficiency,an unsymmetrical quantum key distribution scheme that employs Greenberger-Horne-Zeilinger(GHZ) triplet states and dense coding mechanism is proposed,in which a GHZ triplet state can be used to share two bits of classical information.The proposed scheme can be employed in a noisy or lossy quantum channel.In addition,a general approach to security analysis against general individual attacks is presented.
