Many-region vacuum entanglement: Distilling a W state

Jonathan Silman*, Benni Reznik

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


We investigate the correlations between any number of arbitrarily far-apart regions of the vacuum of the free Klein-Gordon field by means of its finite duration coupling to an equal number of localized detectors. We show that the correlations between any N such regions enable us to distill an N-partite W state, and therefore exhibit true N-fold entanglement. Furthermore, we show that for N=3, the correlations cannot be reproduced by a hybrid local-nonlocal hidden-variable model. For N≥4 the issue remains open.

Original languageEnglish
Article number054301
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number5
StatePublished - May 2005


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