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arXiv quant-ph/0004100quant-ph
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量子通信中的轮数

On rounds in quantum communication

Hartmut Klauck

摘要:

我们研究了两个参与者量子通信协议中相互作用的功率。我们的主要结果是指针跳转函数$f_k$的循环通信层次结构。我们表明,$f_k$需要量子通信$Ω(n)$,如果鲍勃开始的通信和轮数限制为$k$(对于任何常数$k$)。简单地说,如果Alice启动,则$k$轮中的$O(k\log n)$通信就足够了。下界采用的结果,相关的相对冯诺伊曼熵之间的密度矩阵,以他们的迹距离,并使用一个新的措施的信息。我们还描述了一个经典的概率$k$轮协议与通信$O(n/k\cdot(\log^{(k/2)}n+\log k)+k\log n)$中,鲍勃开始的通信。此外,作为指针跳跃的下界的结果,我们表明,任何$k$轮量子协议的不相交性问题需要通信$Ω(n^{1/k})$的$k=O(1)$。

英文摘要:

We investigate the power of interaction in two player quantum communication protocols. Our main result is a rounds-communication hierarchy for the pointer jumping function $f_k$. We show that $f_k$ needs quantum communication $Ω(n)$ if Bob starts the communication and the number of rounds is limited to $k$ (for any constant $k$). Trivially, if Alice starts, $O(k\log n)$ communication in $k$ rounds suffices. The lower bound employs a result relating the relative von Neumann entropy between density matrices to their trace distance and uses a new measure of information. We also describe a classical probabilistic $k$ round protocol with communication $O(n/k\cdot(\log^{(k/2)}n+\log k)+k\log n)$ in which Bob starts the communication. Furthermore as a consequence of the lower bound for pointer jumping we show that any $k$ round quantum protocol for the disjointness problem needs communication $Ω(n^{1/k})$ for $k=O(1)$.

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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