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Entangled Photon Pairs from Semiconductor Quantum Dots N. Akopian, N. H. Lindner, E. Poem, Y. Berlatzky, J. Avron, and D. Gershoni*
 

Summary: Entangled Photon Pairs from Semiconductor Quantum Dots
N. Akopian, N. H. Lindner, E. Poem, Y. Berlatzky, J. Avron, and D. Gershoni*
Department of Physics, Technion--Israel Institute of Technology, Haifa 32000, Israel
B. D. Gerardot and P. M. Petroff
Materials Department, University of California Santa Barbara, California 93106, USA
(Received 19 January 2006; published 6 April 2006)
Tomographic analysis demonstrates that the polarization state of pairs of photons emitted from a
biexciton decay cascade becomes entangled when spectral filtering is applied. The measured density
matrix of the photon pair satisfies the Peres criterion for entanglement by more than 3 standard deviations
of the experimental uncertainty and violates Bell's inequality. We show that the spectral filtering erases the
``which path'' information contained in the photons' color and that the remanent information in the
quantum dot degrees of freedom is negligible.
DOI: 10.1103/PhysRevLett.96.130501 PACS numbers: 03.65.Ud, 03.67.Mn, 42.50.Dv, 78.67.Hc
Entanglement, the intriguing correlations of quantum
systems [13], is an essential resource of quantum infor-
mation and communication [46]. Entangled photons are
particularly attractive for applications due to their non-
interacting nature and the ease by which they can be
manipulated. Polarization entangled photons are routinely
produced by nonlinear optical effects, predominantly by

  

Source: Avron, Joseph - Physics Department, Technion, Israel Institute of Technology

 

Collections: Physics