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New approach for obtaining the time-evolution law of chaotic light field in damping—gaining process
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A new approach for studying the time-evolution law of chaotic light field in damping-gaining coexisting process is presented. The new differential equation for determining the parameter of the density operator ρ(t) is derived and the solution of f′ for damping and gaining processes are studied separately. Our approach is direct and the result is concise since it is not necessarily for us to know the Kraus operators in advance. 相似文献
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两军问题的量子同步通信协议 总被引:2,自引:0,他引:2
基于量子信息中的EPR(Einstein-Podolsky-Rosen)关联对2个粒子之间的关联性和量子隐形传态技术,通过不可靠信道建立可靠的信道,设计了一个量子同步通信协议,有效地解决了两军问题.该量子同步通信协议在经典通信和量子通信中都有重要的应用价值. 相似文献
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Dissipation of a two-mode squeezed vacuum state in the single-mode amplitude damping channel
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We explore how a two-mode squeezed vacuum state sechθ ea+b+ tanh θ |00> evolves when it undergoes a singlemode amplitude dissipative channel with rate of decay κ. We find that in this process not only the squeezing parameter decreases, tanh θ → e-κt tanh θ, but also the second-mode vacuum state evolves into a chaotic state exp{b+bln[1 - e-2κt tanh2 θ]}. The outcome state is no more a pure state, but an entangled mixed state. 相似文献
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分析经典选择重传自动请求重传(automatic repeat-request,ARQ)协议之后,利用量子力学中纠缠态的非定域关联性,提出了数据链路层的选择重传ARQ量子同步通信协议.该协议把链路分为准备阶段和发送阶段.在线路准备阶段完成EPR(Einstein-Podolsky-Rosen)关联对的分发,建立量子信道;在发送阶段完成数据帧和量子确认帧的传送.从吞吐量和信道利用率等方面比较分析了几种常见的数据链路层通信协议的性能.研究表明,该协议可以有效地提高数据链路层的最大吞吐量和信道利用率,改善选择重传ARQ协议的性能,在受时间瓶颈限制的通信中有着重要的应用价值. 相似文献
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We find that second-order coherence as well as a Hanbury-Brown-Twiss intensity interferometer may provide an optimal approach for eavesdropping detection in the quantum key distribution based on two-mode squeezed vacuum states. With this approach, eavesdropping can be easily detected without sacrificing extra secret bits as the test key. In addition, the efficiency of the quantum key distribution protocol is enhanced greatly. 相似文献