Linear optical scheme to demonstrate genuine multipartite entanglement for single-particleWstates

2008/03/31 by Hyunchul Nha
Computer Science · Physics and Astronomy · #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #quant-ph

paper · pdf · doi:10.1103/physreva.77.062328

published as Phys. Rev. A 77, 062328 (2008) · 6 pages, new scheme proposed with improved efficiency, published version

openalex publication_date 2008/06/18 · arxiv created 2008/06/27 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We consider the method of entanglement witness operator to verify genuine multipartite entanglement for single-particle W states involving N parties. In particular, linear optical schemes using photodetectors and beam splitters are proposed to implement two different types of witness operator in experiment. The first scheme that requires only a single measurement setting is shown to detect genuine multipartite entanglement for the overall efficiency beyond 1\ensuremath-1/N. On the other hand, the second scheme with N+1 measurement settings achieves success at a significantly lowered efficiency than 1\ensuremath-1/N.

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