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arXiv cs/0411076cs.CCquant-ph
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Hamming距离的确定性和量子通信复杂性的下界

Lower bounds on the Deterministic and Quantum Communication Complexity of Hamming Distance

Andris Ambainis, William Gasarch, Aravind Srinavasan, Andrey Utis

摘要:

Alice和Bob想知道两个长度为n的字符串是否几乎相等。也就是说,它们在\textit{at most}上是否有一点不同?设0 \leq为\leq n-1。我们表明,任何确定性的协议,以及任何无错误的量子协议(C* 版本),这个问题需要至少n-2位的通信。对于确定两个字符串是否相差一个位的问题,我们给出了相同的界限。我们还证明了无差错Q* 量子协议的一个下界n/2-1。我们的结果是通过下界适当的矩阵的秩。

英文摘要:

Alice and Bob want to know if two strings of length n are almost equal. That is, do they differ on \textit{at most} a bits? Let 0\leq a\leq n-1. We show that any deterministic protocol, as well as any error-free quantum protocol (C* version), for this problem requires at least n-2 bits of communication. We show the same bounds for the problem of determining if two strings differ in exactly a bits. We also prove a lower bound of n/2-1 for error-free Q* quantum protocols. Our results are obtained by lower-bounding the ranks of the appropriate matrices.

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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