77 citations · 264 across the 21 of their papers we have counts for
4 papers · 2 filters
Unambiguous comparison of ensembles of quantum states
Michal Sedlak, Mario Ziman, Vladimir Buzek +1
We present a solution of the problem of the optimal unambiguous comparison of two ensembles of unknown quantum states (psi_1)^k and (psi_2)^l. We consider two cases: 1) The two unk…
Discrimination of quantum observables using limited resources
Mario Ziman, Teiko Heinosaari
We address the problem of unambiguous discrimination and identification among quantum observables. We set a general framework and investigate in details the case of qubit observabl…
Optimality of private quantum channels
Jan Bouda, Mario Ziman
We addressed the question of optimality of private quantum channels. We have shown that the Shannon entropy of the classical key necessary to securely transfer the quantum informat…
Entanglement measures: state ordering vs local operations
Mario Ziman, Vladimir Buzek
A set of all states of a bi-partite quantum system can be divided into subsets each of which contains states with the same degree of entanglement. In this paper we address a questi…