Coherence measure of ensembles with nonlocality without entanglement

Abstract

Irreversibility between preparation and discrimination processes is manifested in the indistinguishability of orthogonal product states via local operations and classical communication (LOCC). Characterizing quantum properties for sets of states according to their local distinguishing property is one of the avenues to explain the surprising results obtained in the LOCC indistinguishability domain. We introduce a measure based on l1 norm and relative entropy of coherence whose lower values capture more quantumness in ensembles. In particular, it reaches the maximum for two-way distinguishable product ensembles with minimum rounds. Moreover, to establish the hierarchy between different product ensembles, we report that the trends of success probabilities for orthogonal product ensembles with one-way LOCC via minimum error discrimination scheme are also connected with the coherence-based measures.