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arXiv 1609.01600quant-phcs.DS
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量子条件查询复杂度

Quantum conditional query complexity

Imdad S. B. Sardharwalla, Sergii Strelchuk, Richard Jozsa

摘要:

我们定义并研究了一种新型的量子预言机,量子条件预言机,它提供了与底层分布相关的条件概率的预言机访问。在其他属性中,我们(a)获得了最知名的量子算法的速度提升,用于概率分布的身份测试,等价性测试和均匀性测试;(b)研究了这些预言机用于测试布尔函数属性的能力,并获得了一个算法,用于检查$n$ -输入$m$ -输出布尔函数是否平衡或$ε$ -远离平衡;以及(c)给出一个次线性算法,需要$\tilde{O}(n^{3/4}/ε)$查询,用于测试$n$维量子态是否是最大混合的.

英文摘要:

We define and study a new type of quantum oracle, the quantum conditional oracle, which provides oracle access to the conditional probabilities associated with an underlying distribution. Amongst other properties, we (a) obtain speed-ups over the best known quantum algorithms for identity testing, equivalence testing and uniformity testing of probability distributions; (b) study the power of these oracles for testing properties of boolean functions, and obtain an algorithm for checking whether an $n$-input $m$-output boolean function is balanced or $ε$-far from balanced; and (c) give a sub-linear algorithm, requiring $\tilde{O}(n^{3/4}/ε)$ queries, for testing whether an $n$-dimensional quantum state is maximally mixed or not.

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