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arXiv 1409.4355quant-phcs.ET
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z-旋转的最佳无环Clifford+V逼近

Optimal ancilla-free Clifford+V approximation of z-rotations

Neil J. Ross

摘要:

我们描述了一种新的高效算法,通过无辅助线的Clifford+V电路来逼近z旋转,直至给定的精度epsilon。我们的算法是最佳的整数分解的神谕的存在下:它输出最短的Clifford+V电路解决给定的问题实例。在没有这样一个预言的情况下,我们的算法仍然是接近最优的,产生V计数m + O(log(log(1/log)的电路,其中m是第三个最优解的V计数。该算法的限制版本近似于泡利+V门集合中的z旋转。我们的方法是基于以前的工作,作者和Selinger的最佳辅助无近似的z-旋转使用Clifford+T门和以前的工作Bocharov,Gurevich和Svore的渐近最佳辅助无近似的z-旋转使用Clifford+V门。

英文摘要:

We describe a new efficient algorithm to approximate z-rotations by ancilla-free Clifford+V circuits, up to a given precision epsilon. Our algorithm is optimal in the presence of an oracle for integer factoring: it outputs the shortest Clifford+V circuit solving the given problem instance. In the absence of such an oracle, our algorithm is still near-optimal, producing circuits of V-count m + O(log(log(1/epsilon))), where m is the V-count of the third-to-optimal solution. A restricted version of the algorithm approximates z-rotations in the Pauli+V gate set. Our method is based on previous work by the author and Selinger on the optimal ancilla-free approximation of z-rotations using Clifford+T gates and on previous work by Bocharov, Gurevich, and Svore on the asymptotically optimal ancilla-free approximation of z-rotations using Clifford+V gates.

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