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Quadripartite entanglement from coupled type I second harmonic generation
Author(s) -
Juan Guo,
Shuqin Zhai,
Zehui Zhai
Publication year - 2015
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.201500182
Subject(s) - quantum entanglement , continuous variable , multipartite entanglement , separable space , physics , multipartite , quantum mechanics , amplitude , w state , quantum correlation , multi mode optical fiber , quantum , squashed entanglement , quantum discord , mathematics , mathematical analysis , optics , statistics , optical fiber
We present a feasible protocol of continuous variable quadripartite entanglement from the coupled type I second harmonic generation (SHG) below threshold. According to the sufficient inseparability criteria for multipartite continuous variable (CV) entanglement, the four output fields are proved to be multicolored entangled beams in separable locations with four‐mode amplitude quadratures correlation and relative phase quadratures correlation. It shows that the coupled system can produce a compact tunable multimode entangled source that can be applied into the quantum communication.