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 1-1/N. On the other hand, the second scheme with N+1 measurement settings achieves success at a significantly lowered efficiency than 1-1/N.
|Journal||Physical Review A - Atomic, Molecular, and Optical Physics|
|Publication status||Published - 18 Jun 2008|
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics