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arXiv 0810.1761quant-ph
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六能级系统的无偏基(Hadamards):来自傅立叶的四种方法

Unbiased bases (Hadamards) for 6-level systems: Four ways from Fourier

A. J. Skinner, V. A. Newell, R. Sanchez

摘要:

在量子力学中,有些性质是最大程度不相容的,例如粒子的位置和动量,或2能级自旋的垂直和水平投影。给定一个属性的任何确定状态,另一个属性是完全随机的,或者是无偏的。对于N级系统,6级的是最小的一个层析成像有效的一组N+1相互无偏基地(MUBs)还没有发现。为了便于搜索,我们在数值上扩展分类的无偏基地,或Hadamards,通过增量调整相对相位在一个标准的基础上。我们考虑的非幺正性所造成的小调整与二阶泰勒展开,并选择增量步骤内的4维零空间的曲率。这样,我们规定了一个数值积分的一个4参数集的阿达玛6阶。

英文摘要:

In quantum mechanics some properties are maximally incompatible, such as the position and momentum of a particle or the vertical and horizontal projections of a 2-level spin. Given any definite state of one property the other property is completely random, or unbiased. For N-level systems, the 6-level ones are the smallest for which a tomographically efficient set of N+1 mutually unbiased bases (MUBs) has not been found. To facilitate the search, we numerically extend the classification of unbiased bases, or Hadamards, by incrementally adjusting relative phases in a standard basis. We consider the non-unitarity caused by small adjustments with a second order Taylor expansion, and choose incremental steps within the 4-dimensional nullspace of the curvature. In this way we prescribe a numerical integration of a 4-parameter set of Hadamards of order 6.

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