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arXiv quant-ph/0411020quant-ph
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量子自旋网络中任意态的完全转移

Perfect Transfer of Arbitrary States in Quantum Spin Networks

Matthias Christandl, Nilanjana Datta, Tony C. Dorlas, Artur Ekert, Alastair Kay, Andrew J. Landahl

摘要:

我们提出了一类量子比特网络,它允许任意二维量子态在固定的时间内进行完全态转移。我们进一步表明,这样的网络可以在两个遥远的当事人之间分配任意的纠缠态,并可以通过并行使用这样的系统,通过网络传输更高的维度系统状态。与许多其他量子计算和通信方案不同,这些网络不需要打开和关闭量子位耦合。当仅限于$N$ -量子位自旋网络的量子位耦合相同时,我们证明了$2\log_3 N$是超立方体几何的最大完美通信距离。此外,如果允许量子位之间固定但不同的耦合,则可以在线性链中的任意长距离上实现完美的状态转移。本文扩展和延伸了PRL 92,187902中所做的工作。

英文摘要:

We propose a class of qubit networks that admit perfect state transfer of any two-dimensional quantum state in a fixed period of time. We further show that such networks can distribute arbitrary entangled states between two distant parties, and can, by using such systems in parallel, transmit the higher dimensional systems states across the network. Unlike many other schemes for quantum computation and communication, these networks do not require qubit couplings to be switched on and off. When restricted to $N$-qubit spin networks of identical qubit couplings, we show that $2\log_3 N$ is the maximal perfect communication distance for hypercube geometries. Moreover, if one allows fixed but different couplings between the qubits then perfect state transfer can be achieved over arbitrarily long distances in a linear chain. This paper expands and extends the work done in PRL 92, 187902.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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