Phys. Rev. A 68, 042102 (2003) [4 pages]Entangled light in moving framesReceived 17 March 2003; published 7 October 2003 We calculate the entanglement between a pair of polarization-entangled photon beams as a function of the reference frame, in a fully relativistic framework. We find the transformation law for helicity basis states and show that, while it is frequency independent, a Lorentz transformation on a momentum-helicity eigenstate produces a momentum-dependent phase. This phase leads to changes in the reduced polarization density matrix, such that entanglement is either decreased or increased, depending on the boost direction, the rapidity, and the spread of the beam. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.68.042102
DOI:
10.1103/PhysRevA.68.042102
PACS:
03.65.Ud, 03.30.+p, 03.67.Mn
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