Characterization of spectral entanglement of spontaneous parametric-down conversion biphotons in femtosecond pulsed regime

We verified the operational approach based on the direct measurement of the entanglement degree for bipartite systems. In particular spectral distributions of single counts and coincidence for pure biphoton states generated by a train of short pump pulses have been measured and the entanglement quan...

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Bibliographic Details
Published in:Europhysics letters 2009-09, Vol.87 (6), p.64003
Main Authors: Brida, G, Caricato, V, Fedorov, M. V, Genovese, M, Gramegna, M, Kulik, S. P
Format: Article
Language:English
Subjects:
03.65.Ud
03.67.Mn
42.65.Lm
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Summary:We verified the operational approach based on the direct measurement of the entanglement degree for bipartite systems. In particular spectral distributions of single counts and coincidence for pure biphoton states generated by a train of short pump pulses have been measured and the entanglement quantifier has been calculated. The approach gives an upper bound of entanglement stored in total biphoton states, which can reach extremely high values up to 104–105.
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/87/64003