Polarization squeezing and continuous-variable polarization entanglement

Korolkova, N., Leuchs, G., Loudon, R., Ralph, T.C. and Silberhorn, C. (2002) Polarization squeezing and continuous-variable polarization entanglement. Physical Review A, 65 5: 052306-1-052306-12. doi:10.1103/PhysRevA.65.052306

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Author Korolkova, N.
Leuchs, G.
Loudon, R.
Ralph, T.C.
Silberhorn, C.
Title Polarization squeezing and continuous-variable polarization entanglement
Journal name Physical Review A   Check publisher's open access policy
ISSN 1050-2947
Publication date 2002-01-01
Year available 2002
Sub-type Article (original research)
DOI 10.1103/PhysRevA.65.052306
Open Access Status File (Publisher version)
Volume 65
Issue 5
Start page 052306-1
End page 052306-12
Total pages 12
Editor Crasemann, B.
Place of publication New York
Publisher American Physical Society
Language eng
Subject C1
240201 Theoretical Physics
780102 Physical sciences
02 Physical Sciences
Abstract A concept of polarization entanglement for continuous variables is introduced. For this purpose the Stokes-parameter operators and the associated Poincare sphere, which describe the quantum-optical polarization properties of light, are defined and their basic properties are reviewed. The general features of the Stokes operators are illustrated by evaluation of their means and variances for a range of simple polarization states. Some of the examples show polarization squeezing, in which the variances of one or more Stokes parameters are smaller than the coherent-state value. The main object of the paper is the application of these concepts to bright squeezed light. It is shown that a light beam formed by interference of two orthogonally polarized quadrature-squeezed beams exhibits squeezing in some of the Stokes parameters. Passage of such a primary polarization-squeezed beam through suitable optical components generates a pair of polarization-entangled light beams with the nature of a two-mode squeezed state. Implementation of these schemes using the double-fiber Sagnac interferometer provides an efficient method for the generation of bright nonclassical polarization states. The important advantage of these nonclassical polarization states for quantum communication is the possibility of experimentally determining all of the relevant conjugate variables of both squeezed and entangled fields using only linear optical elements followed by direct detection.
Keyword Optics
Physics, Atomic, Molecular & Chemical
Quantum Communication
States
Light
Teleportation
Generation
Criterion
Systems
Phase
Q-Index Code C1
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Physical Sciences Publications
 
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Created: Wed, 15 Aug 2007, 03:16:23 EST