Departamento de Física, Universidad de Concepción, Barrio Universitario, Casilla 160-C, Concepción, Chile.
Phys Rev Lett. 2011 Aug 19;107(8):080401. doi: 10.1103/PhysRevLett.107.080401. Epub 2011 Aug 16.
The roles of quantum correlations, entanglement, discord, and dissonance needed for performing unambiguous quantum state discrimination assisted by an auxiliary system are studied. In general, this procedure for conclusive recognition between two nonorthogonal states relies on the availability of entanglement and discord. However, we find that there exist special cases for which the procedure can be successfully achieved without entanglement. In particular, we show that the optimal case for discriminating between two nonorthogonal states prepared with equal a priori probabilities does not require entanglement but quantum dissonance only.
研究了在辅助系统的帮助下进行明确的量子态区分时所需的量子相关性、纠缠、失谐和失谐的作用。一般来说，这种用于在两个非正交态之间进行明确识别的过程依赖于纠缠和失谐的可用性。然而，我们发现存在一些特殊情况，在这些情况下，即使没有纠缠也可以成功地完成该过程。具体来说，我们表明，对于以相等的先验概率制备的两个非正交态的最佳区分情况不需要纠缠，而只需要量子失谐。
