Off-diagonal geometric phase for mixed states.

Journal: Physical review letters
Published Date: Feb 3, 2003

Abstract

We extend the off-diagonal geometric phase [Phys. Rev. Lett. 85, 3067 (2000)]] to mixed quantal states. The nodal structure of this phase in the qubit (two-level) case is compared with that of the diagonal mixed state geometric phase [Phys. Rev. Lett. 85, 2845 (2000)]]. Extension to higher dimensional Hilbert spaces is delineated. A physical scenario for the off-diagonal mixed state geometric phase in polarization-entangled two-photon interferometry is proposed.

Authors

  • Stefan Filipp
    Department of Quantum Chemistry, Uppsala University, Box 518, Sweden. stefan@copilot.at
  • Erik Sjöqvist

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