Phys. Rev. Lett. 93, 193901 (2004) [4 pages]Quantum Entanglement of a Large Number of PhotonsSee Also: Editorial Note Received 16 December 2003; revised 4 August 2004; published 4 November 2004 A bipartite multiphoton entangled state is created through stimulated parametric down-conversion of strong laser pulses in a nonlinear crystal. It is shown how detectors that do not resolve the photon number can be used to analyze such multiphoton states. Entanglement of up to 12 photons is detected using both the positivity of the partially-transposed density matrix and a newly derived criteria. Furthermore, evidence is provided for entanglement of up to 100 photons. The multiparticle quantum state is such that even in the case of an overall photon collection and detection efficiency as low as a few percent, entanglement remains and can be detected. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.193901
DOI:
10.1103/PhysRevLett.93.193901
PACS:
42.50.Dv, 42.65.Lm, 03.65.Ud
See AlsoEditorial Note: H. S. Eisenberg, G. Khoury, G. Durkin, C. Simon, and D. Bouwmeester, Editorial Note: Quantum Entanglement of a Large Number of Photons [Phys. Rev. Lett. 93, 193901 (2004)], Phys. Rev. Lett. 93, 219901 (2004). |
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