Entanglement persistency of multiphoton entangled states.
We experimentally demonstrate the entanglement persistency when losing photons in three- and four-photon polarization-entangled states. The entanglement properties of the mixed states obtained from multiphoton spontaneous parametric down-conversion are studied via witness and positive partial transpose approaches. Together with a quantification of the bipartite entanglement such analysis enables intuitive understanding of novel multiparty quantum communication protocols.
Bourennane
Mohamed
M
Physics Department, Stockholm University, S-106 91 Stockholm, Sweden.
Eibl
Manfred
M
Gaertner
Sascha
S
Kiesel
Nikolai
N
Kurtsiefer
Christian
C
Weinfurter
Harald
H