Distribution of time-bin entangled qubits over 50 km of optical fiber

I Marcikic; H de Riedmatten; W Tittel; H Zbinden; M Legré; N Gisin

doi:10.1103/PhysRevLett.93.180502

Distribution of time-bin entangled qubits over 50 km of optical fiber

Phys Rev Lett. 2004 Oct 29;93(18):180502. doi: 10.1103/PhysRevLett.93.180502. Epub 2004 Oct 28.

Authors

I Marcikic¹, H de Riedmatten, W Tittel, H Zbinden, M Legré, N Gisin

Affiliation

¹ Group of Applied Physics-Optique, University of Geneva, CH-1211 Geneva 4, Switzerland.

PMID: 15525142
DOI: 10.1103/PhysRevLett.93.180502

Abstract

We report experimental distribution of time-bin entangled qubits over 50 km of optical fibers. Using actively stabilized preparation and measurement devices we demonstrate violation of the Clauser-Horne-Shimony-Holt Bell inequality by more than 15 standard deviations without removing the detector noise. In addition we report a proof-of principle experiment of quantum key distribution over 50 km of optical fibers using entangled photon.