Recently Yang,Chu,and Han [Phys.Rev.A 70 (2004) 022329] presented a new type of multipartiteentangled states for implementing efficient many-party controlled teleportation of multiqubit quantum information.Herewe prop...Recently Yang,Chu,and Han [Phys.Rev.A 70 (2004) 022329] presented a new type of multipartiteentangled states for implementing efficient many-party controlled teleportation of multiqubit quantum information.Herewe propose a simple scheme for preparing such a type of multi-atom entangled states in cavity quantum electrodynamics(QED).The scheme involves atom-cavity interaction with large detuning,and is immune to the cavity decay and thethermal field states.Some practical analyses show its availability with the present technology.展开更多
We propose a scheme for teleportation of four-level atomic states in thermal cavities. The scheme does not involve the generalized Bell-state or generalized GHZ-state measurement, which is difficult in practice. Anoth...We propose a scheme for teleportation of four-level atomic states in thermal cavities. The scheme does not involve the generalized Bell-state or generalized GHZ-state measurement, which is difficult in practice. Another feature of the scheme is that it does not require individual addressing of atoms in cavity and is insensitive to both cavity decay and thermal field, which is of importance in point of experiment.展开更多
在过去的一段时间里,许多技术在各自的领域范围内得到了迅猛的发展。本文中我们致力于讨论这些技术的一体化。我们的目的在于展示一种行之有效的一体化方法,用此法处理环境问题时,综合利用所有工具和技术将比彼此分离的使用它们更有效...在过去的一段时间里,许多技术在各自的领域范围内得到了迅猛的发展。本文中我们致力于讨论这些技术的一体化。我们的目的在于展示一种行之有效的一体化方法,用此法处理环境问题时,综合利用所有工具和技术将比彼此分离的使用它们更有效。本文主要基于近期在遥感国际期刊(International Journal of Remote Sensing)(Xue et al.2002)发表的一篇论文,以及一些在该论文发表后的由中国科学院遥感应用研究所的薛勇博士领导的研究小组在研究这一课题产生的其他想法。展开更多
We propose a scheme for generating Bell states involving two SQUID-based charge qubits by coupling themto a nanomechanical resonator.We also show that it is possible to implement a two-qubit logic gate between the two...We propose a scheme for generating Bell states involving two SQUID-based charge qubits by coupling themto a nanomechanical resonator.We also show that it is possible to implement a two-qubit logic gate between the twocharge qubits by choosing carefully the interaction time.展开更多
In this paper, we study quantum teleportation of atomic states via a hybrid entangled state （HES） involving an atom and a cavity field. And we investigate how to implement controlled phase （CP） gates between atomi...In this paper, we study quantum teleportation of atomic states via a hybrid entangled state （HES） involving an atom and a cavity field. And we investigate how to implement controlled phase （CP） gates between atomic internal states and coherent states of cavity field. We also discuss the methods of distinguishing coherent states [±α〉 in a cavity. Finally, a brief discussion about the feasibility of this scheme in experiment is presented.展开更多
We present an experimentally feasible one-step discrimination scheme on Bell bases with trapped ions, and then generalize it to the case of N-ion Greenberger-Horne-Zeilinger （GHZ） bases. In the scheme, all the ortho...We present an experimentally feasible one-step discrimination scheme on Bell bases with trapped ions, and then generalize it to the case of N-ion Greenberger-Horne-Zeilinger （GHZ） bases. In the scheme, all the orthogonal and complete N-ion GHZ internal states can be exactly discriminated only by one step, and thus it takes very short time. Moreover, the scheme is insensitive to thermal motion and dose not require the individual addressing of the ions. The Bell-state and GHZ-state one-step discrimination scheme can be widely used in quantum information processing based on ion-trap set-up.展开更多
Dense coding of multi-atom entangled states in cavity QED is studied. If the quantum channel is generalized GHZ states, dense coding can be directly realized in a simply way. As for the partially entangled pure states...Dense coding of multi-atom entangled states in cavity QED is studied. If the quantum channel is generalized GHZ states, dense coding can be directly realized in a simply way. As for the partially entangled pure states, we propose a feasible protocol for entanglement concentration, and the emciency of information transmitted is calculated. The schemes are insensitive to the cavity decay and the field state, due to the fact that the interaction here is a large-detuned one between atoms and the cavity.展开更多
基金the Natural Science Foundation of Hunan Province under Grant No.06JJ5015the Scientific Research Fund of the Education Department of Hunan Province under Grant No.06C354
文摘Recently Yang,Chu,and Han [Phys.Rev.A 70 (2004) 022329] presented a new type of multipartiteentangled states for implementing efficient many-party controlled teleportation of multiqubit quantum information.Herewe propose a simple scheme for preparing such a type of multi-atom entangled states in cavity quantum electrodynamics(QED).The scheme involves atom-cavity interaction with large detuning,and is immune to the cavity decay and thethermal field states.Some practical analyses show its availability with the present technology.
基金The project supported by the Scientific Research Fund of Education Department of Hunan Province of China under Grant No. 06C354, the Natural Science Foundation of Hunan Province of China under Grant No. 06JJ50015
文摘We propose a scheme for teleportation of four-level atomic states in thermal cavities. The scheme does not involve the generalized Bell-state or generalized GHZ-state measurement, which is difficult in practice. Another feature of the scheme is that it does not require individual addressing of atoms in cavity and is insensitive to both cavity decay and thermal field, which is of importance in point of experiment.
文摘在过去的一段时间里,许多技术在各自的领域范围内得到了迅猛的发展。本文中我们致力于讨论这些技术的一体化。我们的目的在于展示一种行之有效的一体化方法,用此法处理环境问题时,综合利用所有工具和技术将比彼此分离的使用它们更有效。本文主要基于近期在遥感国际期刊(International Journal of Remote Sensing)(Xue et al.2002)发表的一篇论文,以及一些在该论文发表后的由中国科学院遥感应用研究所的薛勇博士领导的研究小组在研究这一课题产生的其他想法。
基金The project supported by National Natural Science Foundation of China under Grant No.10325523the National Fundamental Research Program of China under Grant No.2001CB309310the Scientific Research Fund of the Education Department of Hunan Province under Grant No.06C354
文摘We propose a scheme for generating Bell states involving two SQUID-based charge qubits by coupling themto a nanomechanical resonator.We also show that it is possible to implement a two-qubit logic gate between the twocharge qubits by choosing carefully the interaction time.
基金The project supported by the Scientific Research Fund of Education Department of Hunan Province under Grant No.06C354 and the Natural Science Foundation of Hunan Province under Grant No. 06JJ5015 tCorresponding author,
文摘In this paper, we study quantum teleportation of atomic states via a hybrid entangled state （HES） involving an atom and a cavity field. And we investigate how to implement controlled phase （CP） gates between atomic internal states and coherent states of cavity field. We also discuss the methods of distinguishing coherent states [±α〉 in a cavity. Finally, a brief discussion about the feasibility of this scheme in experiment is presented.
基金Project supported by the Scientific Research Fund of Hunan Provincial Education Department, China （Grant No 06C354）, the Natural Science Foundation of Hunan Province, China （Grant No 06JJ50015） and the fund from Hunan University of Science and Engineering, China （Grant No 05-49）.
文摘We present an experimentally feasible one-step discrimination scheme on Bell bases with trapped ions, and then generalize it to the case of N-ion Greenberger-Horne-Zeilinger （GHZ） bases. In the scheme, all the orthogonal and complete N-ion GHZ internal states can be exactly discriminated only by one step, and thus it takes very short time. Moreover, the scheme is insensitive to thermal motion and dose not require the individual addressing of the ions. The Bell-state and GHZ-state one-step discrimination scheme can be widely used in quantum information processing based on ion-trap set-up.
基金Supported by the Scientific Research Fund of the Education Department of Hunan Province under Grant No 06C354, and the Hunan Provincial Natural Science Foundation of China under Grant No 06JJ5015.
文摘Dense coding of multi-atom entangled states in cavity QED is studied. If the quantum channel is generalized GHZ states, dense coding can be directly realized in a simply way. As for the partially entangled pure states, we propose a feasible protocol for entanglement concentration, and the emciency of information transmitted is calculated. The schemes are insensitive to the cavity decay and the field state, due to the fact that the interaction here is a large-detuned one between atoms and the cavity.
