2014/01/31 by Li-Fang Xu, L. F. Xu, Fu-Lin Zhang +5
Computer Science · Physics and Astronomy · #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum channel #Quantum discord #Quantum entanglement #Quantum information #Quantum state #Quantum teleportation #Qubit #Qutrit #State (computer science) #quant-ph
paper · pdf · doi:10.1209/0295-5075/106/50004
published as EPL, 106 (2014) 50004 · 6 pages, 3 figures. Accepted by EPL. We extended the protocol for assisted optimal state discrimination to the case with positive real overlaps, and presented a proof for the absence of entanglement
openalex publication_date 2014/06/01 · arxiv created 2014/06/28 · arxiv updated 2014/07/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
A fundamental problem in quantum information is to explore the roles of different quantum correlations in a quantum information procedure. Recent work [Phys. Rev. Lett., 107 (2011) 080401] shows that the protocol for assisted optimal state discrimination (AOSD) may be implemented successfully without entanglement, but with another correlation, quantum dissonance. However, both the original work and the extension to discrimination of d states [Phys. Rev. A, 85 (2012) 022328] have only proved that entanglement can be absent in the case with equal a priori probabilities. By improving the protocol in [Sci. Rep., 3 (2013) 2134], we investigate this topic in a simple case to discriminate three nonorthogonal states of a qutrit, with positive real overlaps. In our procedure, the entanglement between the qutrit and an auxiliary qubit is found to be completely unnecessary. This result shows that the quantum dissonance may play as a key role in optimal state discrimination assisted by a qubit for more general cases.