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arXiv quant-ph/0208183quant-ph
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Shor因子分解算法成功概率的改进

Improving the Success Probability for Shor's Factoring Algorithm

Gregor Leander

摘要:

给定n=p*q,其中p和q是Z_{p*q} ^* 中的n和y。Shor算法计算y的阶数r,即y^r=1(mod n)。如果r=2k是偶数,并且y^k \ne -1(mod n),我们可以很容易地计算n的一个非平凡因子:gcd(y^k-1,n)。在原来的文件中,它表明,一个随机选择的y是可用的因式分解与概率{1/2}。本文将证明一种有效的可能性,通过只选取Z_n^* 中的特殊y,将此概率的下界提高到{3/4},从而使最坏情况下的故障概率从{1/2}降低到{1/4}。

英文摘要:

Given n=p*q with p and q prim and y in Z_{p*q}^*. Shor's Algorithm computes the order r of y, i.e. y^r=1 (mod n). If r=2k is even and y^k \ne -1 (mod n) we can easily compute a non trivial factor of n: gcd(y^k-1,n). In the original paper it is shown that a randomly chosen y is usable for factoring with probabily {1/2}. In this paper we will show an efficient possibility to improve the lower bound of this probability by selecting only special y in Z_n^* to {3/4}, so we are able to reduce the fault probabilty in the worst case from {1/2} to {1/4}.

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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