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Phys. Rev. Lett. 92, 180401 (2004) [4 pages]

Experimental Demonstration of Single Photon Nonlocality

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Björn Hessmo1,*, Pavel Usachev2, Hoshang Heydari1, and Gunnar Björk1
1Department of Microelectronics and Information Technology, Royal Institute of Technology (KTH), S-16440 Kista, Sweden
2Ioffe Physico-technical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021 Russia

Received 26 November 2003; published 4 May 2004

See accompanying Physics Focus

In this Letter we experimentally implement a single photon Bell test based on the ideas of S. Tan et al. [ Phys. Rev. Lett. 66 252 (1991)] and L. Hardy [ Phys. Rev. Lett. 73 2279 (1994)]. A double homodyne measurement is used to measure correlations in the Fock space spanned by zero and one photons. Local oscillators used in the correlation measurement are distributed to two observers by copropagating it in an orthogonal polarization mode. This method eliminates the need for interferometrical stability in the setup, consequently making it a robust and scalable method.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.180401
DOI:
10.1103/PhysRevLett.92.180401
PACS:
03.65.Ud, 42.50.Xa

*Electronic address: hessmo@imit.kth.se