Optimal detection of quantum information

作者：Asher Peres, William K. Wootters · 发表于：Physical Review Letters · 年份：1991 · DOI：10.1103/physrevlett.66.1119 · 被引用次数：369 · 研究领域：Quantum Information and Cryptography、Quantum Mechanics and Applications、Advanced Thermodynamics and Statistical Mechanics

Two quantum systems are identically prepared in different locations. An observer's task is to determine their state. A simple example shows that a pair of measurements of the von Neumann type is less effective than a sequence of nonorthogonal probability-operator measures, alternating between the two quantum systems. However, the most efficient set of operations of that type that we were able to design falls short of a single combined measurement, performed on both system together.