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Realizing quantum advantage without entanglement in single-photon states

TitleRealizing quantum advantage without entanglement in single-photon states
Publication TypeJournal Article
Year of Publication2017
AuthorsA.. Maldonado-Trapp, P. Solano, A. Hu, and C. W. Clark
JournalNEW JOURNAL OF PHYSICS
Volume19
Pagination053009
Date PublishedMAY 16
Type of ArticleArticle
ISSN1367-2630
Keywordsencoding process, entanglement, quantum advantage, quantum discord, single photons, X-states
Abstract

We propose an optical circuit for attaining quantum measurement advantage in a system that has no quantum entanglement. Our device produces symmetric two-qubit X-states with controllable anti-diagonal elements, and does not require entangled states as input. We discuss the use of this device in a two-qubit quantum game. When entanglement is absent, the maximum quantum advantage in this game is 1/3 bit. A slightly diminished quantum advantage, 0.311 bit, can be realized with a simplified transaction protocol.}, %%Address = {TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND

DOI10.1088/1367-2630/aa6cf4