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Seminar 11/1: Entanglement from longitudinal and scalar photons

Professor James Franson,  University of Maryland
Abstract: Although there have been many recent quantum optics experiments involving entanglement and quantum information, most of those experiments have been analyzed using a theory of photons that is not in obvious agreement with special relativity.  The covariant quantization of the electromagnetic field in the Lorentz gauge gives rise to longitudinal and scalar photons in addition to the usual transverse photons of the Coulomb gauge.  It will be shown that the exchange of longitudinal and scalar photons can produce entanglement between two distant atoms or harmonic oscillators.  The form of the entangled states produced in this way is very different from that obtained in the Coulomb gauge, where the longitudinal and scalar photons do not exist.  It will be shown that all physically observable effects are the same in the two gauges, despite the differences in the form of the entangled states.  An approach of this kind is essential for a covariant description of quantum information theory and it provides further insight into the nature of a photon.

Location: Bowen Hall Auditorium

Date/Time: 11/01/10 at 12:30 pm - 11/01/10 at 01:30 am

Light lunch at 12 noon in the Bowen Hall Atrium

Category: PRISM/MITRE (QES) Seminar Series

Department: QES