Unambiguous discrimination among quantum operations (5 pages)

Runyao Duan, Feng Yun Yu, Mingsheng Ying

Zhang, Ke-Jia, Zhu +8 more

Guoming Wang, Mingsheng Ying

We address the problem of unambiguous discrimination among a given set of quantum operations. The necessary and sufficient condition for them to be unambiguously distinguishable is derived in the cases of single use and multiple uses, respectively. For the latter case we explicitly construct the input states and corresponding measurements that accomplish the task. It is also found that the introduction of entanglement can improve the discrimination.

Anthony Chefles

Guoming Wang, Mingsheng Ying

We address the problem of unambiguous discrimination between a given set of quantum operations. The necessary and sufficient condition for them to be unambiguously distinguishable is derived in the cases of single use and multiple uses respectively. For the latter case we explicitly construct the input states and corresponding measurements that accomplish the task. It is found that the introduction of entanglement can improve the discrimination. The advantage of our strategy over minimum-error discrimination is also discussed.

János A. Bergou, Ulrike Herzog, Mark S. Hillery