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arXiv 1110.4792quant-phmath-phmath.MP
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量子双星实验的比较

Comparison of quantum binary experiments

Anna Jencova

摘要:

量子二元实验由有限维希尔伯特空间上的一对密度算符组成。一个实验E被称为相对于另一个实验F是ε-亏的,如果在ε之前,它的风险函数对于所有的统计决策问题都不比F的风险函数差。在经典统计实验理论中,1。对于成对的概率分布,人们可以限制到测试问题的定义不足和2。0-亏是一个随机映射存在的充分必要条件,该映射将一对映射到另一对上。我们表明,在量子的情况下,性质1。如果E由交换密度组成,则精确成立。至于财产2,证明了如果E关于F是0亏的,则存在一个将E映射到F上的完全正映射,但它不一定是保迹的。

英文摘要:

A quantum binary experiment consists of a pair of density operators on a finite dimensional Hilbert space. An experiment E is called ε-deficient with respect to another experiment F if, up to ε, its risk functions are not worse than the risk functions of F, with respect to all statistical decision problems. It is known in the theory of classical statistical experiments that 1. for pairs of probability distributions, one can restrict to testing problems in the definition of deficiency and 2. that 0-deficiency is a necessary and sufficient condition for existence of a stochastic mapping that maps one pair onto the other. We show that in the quantum case, the property 1. holds precisely if E consist of commuting densities. As for property 2., we show that if E is 0-deficient with respect to F, then there exists a completely positive mapping that maps E onto F, but it is not necessarily trace preserving.

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