Quantal phase for nonmaximally entangled photons

Björn Hessmo and Erik Sjöqvist
Phys. Rev. A 62, 062301 – Published 26 October 2000
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Abstract

We calculate the Pancharatnam phase difference obtained when entangled two-photon states interfere. This phase depends nontrivially on the degree of entanglement between the photons forming the two-photon state. We outline an experiment where the entanglement dependence of the two-photon phase may be studied interferometrically. Also we propose how a cyclic version of this phase may be useful for implementing an efficient quantum gate.

  • Received 4 January 2000

DOI:https://doi.org/10.1103/PhysRevA.62.062301

©2000 American Physical Society

Authors & Affiliations

Björn Hessmo1,2,3,* and Erik Sjöqvist1,4,†

  • 1Department of Quantum Chemistry, Uppsala University, P.O. Box 518, Se-751 20 Uppsala, Sweden
  • 2Institut für Experimentalphysik, Universität Innsbruck, Technikerstrasse 25, A-6020 Innsbruck, Austria
  • 3ITAMP, Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138
  • 4Atominstitut der Österreichischen Universitäten, Stadionallee 2, A-1020 Vienna, Austria

  • *Email address: hessmo@kvac.uu.se
  • †Email address: eriks@kvac.uu.se

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Vol. 62, Iss. 6 — December 2000

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