Intrinsic coherence in assisted sub-state discrimination
Department of Physics, School of Science, Tianjin University - Tianjin 300072, China
Received: 11 October 2016
Accepted: 14 February 2017
We study intrinsic coherence in the tripartite process to unambiguously discriminate two nonorthogonal states of a qubit, entangled with another one, and assisted by an auxiliary system. The optimal success probability is found to be benefited by initial intrinsic coherence, but no extra one is required. The transformations among different contributions of intrinsic coherence are necessary in this procedure, which increase with the overlap between the states to recognize. Such state discrimination is a key step of the probabilistic teleportation protocol. Entanglement of the quantum channel decreases the coherence characterizing the reliance on an ancilla.
PACS: 03.65.Ta – Foundations of quantum mechanics; measurement theory / 03.67.Mn – Entanglement measures, witnesses, and other characterizations / 42.50.Dv – Quantum state engineering and measurements
© EPLA, 2017