Photon position operators and localized bases

Margaret Hawton and William E. Baylis
Phys. Rev. A 64, 012101 – Published 5 June 2001
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Abstract

We extend a procedure for the construction of photon position operators with transverse eigenvectors and commuting components [Phys. Rev. A 59, 954 (1999)] to body rotations described by three Euler angles. The axial angle can be made a function of the two polar angles, and different choices of the functional dependence are analogous to different gauges of a magnetic field. Symmetries broken by a choice of gauge are reestablished by transformations within the gauge group. The approach allows several previous proposals to be related. Because of the coupling of the photon momentum and spin, our position operator, like that proposed by Pryce, is a matrix that does not commute with the spin operator. Unlike the Pryce operator, however, our operator has commuting components, but the commutators of these components with the total angular momentum require an extra term to rotate the matrices for each vector component around the momentum direction. Several proofs of the nonexistence of a photon position operator with commuting components are based on overly restrictive premises that do not apply here.

  • Received 18 December 2000

DOI:https://doi.org/10.1103/PhysRevA.64.012101

©2001 American Physical Society

Authors & Affiliations

Margaret Hawton1 and William E. Baylis2

  • 1Department of Physics, Lakehead University, Thunder Bay, Ontario, Canada P7B 5E1
  • 2Department of Physics, University of Windsor, Windsor, Ontario, Canada N9B 3P4

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Vol. 64, Iss. 1 — July 2001

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