通过自旋链的双量子通信
Duplex quantum communication through a spin chain
摘要：
量子计算机内的数据复用可以允许通过共享介质同时传输多个信息流，从而最小化必要数据传输所需的信道数量。在这里，我们研究了一个双向量子通信协议，使用自旋链放置在外部磁场。在我们的方案中，Alice和Bob分别扮演发送者和接收者的角色，作为两个状态cos（θ1/2）|0> + sin（θ1/2）exp（i <$1）|1>，cos（θ2/2）|0> + sin（θ2/2）exp（i <$2）|1>通过一个通道同时传输。我们发现，在自旋链的每一端的传输保真度通常可以通过第二方的存在而增强。这对于通过自旋链网络建立双工量子通信的可行性是一个重要的结果。
英文摘要：
Data multiplexing within a quantum computer can allow for the simultaneous transfer of multiple streams of information over a shared medium thereby minimizing the number of channels needed for requisite data transmission. Here, we investigate a two-way quantum communication protocol using a spin chain placed in an external magnetic field. In our scheme, Alice and Bob each play the role of a sender and a receiver as two states cos(θ1/2)|0> + sin(θ1/2)exp(iϕ1)|1>, cos(θ2/2)|0> + sin(θ2/2)exp(iϕ2)|1> are transferred through one channel simultaneously. We find that the transmission fidelity at each end of a spin chain can usually be enhanced by the presence of a second party. This is an important result for establishing the viability of duplex quantum communication through spin chain networks.
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