Entanglement Formation and Violation of Bell’s Inequality with a Semiconductor Single Photon Source

David Fattal, Kyo Inoue, Jelena Vučković, Charles Santori, Glenn S. Solomon, and Yoshihisa Yamamoto
Phys. Rev. Lett. 92, 037903 – Published 22 January 2004

Abstract

We report the generation of polarization-entangled photons, using a quantum dot single photon source, linear optics, and photodetectors. Two photons created independently are observed to violate Bell’s inequality. The density matrix describing the polarization state of the postselected photon pairs is reconstructed and agrees well with a simple model predicting the quality of entanglement from the known parameters of the single photon source. Our scheme provides a method to create no more than one entangled photon pair per cycle after postselection, a feature useful to enhance quantum cryptography protocols based on shared entanglement.

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  • Received 8 May 2003

DOI:https://doi.org/10.1103/PhysRevLett.92.037903

©2004 American Physical Society

Authors & Affiliations

David Fattal, Kyo Inoue*, Jelena Vučković, Charles Santori, Glenn S. Solomon, and Yoshihisa Yamamoto*

  • Quantum Entanglement Project, ICORP, JST, Ginzton Laboratory, Stanford University, Stanford, California 94305, USA

  • *Also with NTT Basic Research Laboratories, Atsugishi, Kanagawa, Japan.
  • Also with Institute of Industrial Science, University of Tokyo, Komaba, Meguro-ku, Tokyo, Japan.
  • Also with Solid State Photonics Laboratory, Stanford University, Stanford, CA 94305, USA.

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Issue

Vol. 92, Iss. 3 — 23 January 2004

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