Quantum entanglement of a large number of photons

H. S. Eisenberg*, G. Khoury, G. A. Durkin, C. Simon, D. Bouwmeester

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

123 Scopus citations


The generation of an bipartite entangled state of many photons in two spatial modes was discussed. The bipartite multiphoton entangled was created by stimulted parametric down conversion of strong laser pulses in a nonlinear crystal. Entanglement of up to 12 photons was detected by using positively of the partially transposed desity matrix and a newly derived criteria. Two orthogonal polarizations were separated by a fiber polarization beam splitter and was detected by by avalanche photodiodes (APD). It was observed that it is possible to explore quantum entanglement even after the state suffered losses and even with detectors that have limited photon number resolution.

Original languageAmerican English
Article number193901
Pages (from-to)193901-1-193901-4
JournalPhysical Review Letters
Issue number19
StatePublished - 5 Nov 2004
Externally publishedYes

Bibliographical note

Funding Information:
The authors thank M. de Dood and W. Irvine for fruitful discussion. This research has been supported by NSF Grant No. 0304678 and DARPA Grant No. MDA 972-01-1-0027.


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