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Entanglement on Demand through Time Reordering J. E. Avron, G. Bisker, D. Gershoni, N. H. Lindner, and E. A. Meirom
 

Summary: Entanglement on Demand through Time Reordering
J. E. Avron, G. Bisker, D. Gershoni, N. H. Lindner, and E. A. Meirom
Department of Physics, Technion-Israel Institute of Technology, 32000 Haifa, Israel
R. J. Warburton
School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom
(Received 11 October 2007; published 28 March 2008)
Entangled photons can be generated ``on demand'' in a novel scheme involving unitary time reordering
of the photons emitted in a radiative decay cascade. The scheme yields polarization entangled photon
pairs, even though prior to reordering the emitted photons carry significant ``which path information'' and
their polarizations are unentangled. This shows that quantum chronology can be manipulated in a way that
is lossless and deterministic (unitary). The theory can, in principle, be tested and applied to the biexciton
cascade in semiconductor quantum dots.
DOI: 10.1103/PhysRevLett.100.120501 PACS numbers: 03.67.Mn, 03.65.Ud, 42.50.Dv, 78.67.Hc
Entangled quantum states are an important resource in
quantum information and communication [1]. Entangled
photons are particularly attractive for applications due to
their non interacting nature and the ease by which they can
be manipulated. There is, therefore, considerable interest
in the development of sources for reliable (nonrandom)
polarization entangled photon pairs. Currently, the most

  

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

 

Collections: Physics