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arXiv 0811.4227quant-phcs.ITmath.IT
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纠缠辅助的经典和量子信息通信

Entanglement-assisted communication of classical and quantum information

Min-Hsiu Hsieh, Mark M. Wilde

摘要:

我们考虑在纠缠辅助的量子信道上可靠地传输经典和量子信息的问题。我们的主要结果是一个容量定理,给出了一个三维的可实现的速率区域。区域中的点是速率三元组,包括经典通信速率、量子通信速率和特定编码方案的纠缠消耗速率。实现容量区域边界点的关键协议是一个我们称之为经典增强型父协议的协议。经典增强的父协议比量子香农理论协议家族树中的其他协议更具有一般性,在这个意义上,几个以前已知的量子协议现在是它的子协议。经典增强的父亲协议还显示了对量子比特退相信道的情况下的分时策略的改进--该结果证明了在纠缠辅助的量子信道上同时编码经典和量子信息的需要。我们的容量定理是一个多字母的性质(需要限制在许多使用的通道),但它减少到一个单字母的表征至少有三个通道:完全去极化通道,量子擦除通道,和量子位退相通道。

英文摘要:

We consider the problem of transmitting classical and quantum information reliably over an entanglement-assisted quantum channel. Our main result is a capacity theorem that gives a three-dimensional achievable rate region. Points in the region are rate triples, consisting of the classical communication rate, the quantum communication rate, and the entanglement consumption rate of a particular coding scheme. The crucial protocol in achieving the boundary points of the capacity region is a protocol that we name the classically-enhanced father protocol. The classically-enhanced father protocol is more general than other protocols in the family tree of quantum Shannon theoretic protocols, in the sense that several previously known quantum protocols are now child protocols of it. The classically-enhanced father protocol also shows an improvement over a time-sharing strategy for the case of a qubit dephasing channel--this result justifies the need for simultaneous coding of classical and quantum information over an entanglement-assisted quantum channel. Our capacity theorem is of a multi-letter nature (requiring a limit over many uses of the channel), but it reduces to a single-letter characterization for at least three channels: the completely depolarizing channel, the quantum erasure channel, and the qubit dephasing channel.

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