Work

Quantum Entanglement of a Large Number of Photons

Year: 2004

Type: article

Abstract: 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.

Source: Physical Review Letters

DOI: 10.1103/physrevlett.93.193901

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

Institutions: University of California, Santa Barbara, University of Oxford, Centre National de la Recherche Scientifique, Université Joseph Fourier

Language: English

Topic: Quantum Information and Cryptography

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: National Science Foundation, Defense Advanced Research Projects Agency

Award: NIRT: Quantum-State Transfer Between Photons and Nanostructures