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Entangled Light in Moving Frames

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Abstract

We calculate the entanglement between a pair of polarization-entangled photon beams as a function of the reference frame. We show that 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 not Lorentz invariant.

© 2003 Optical Society of America

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