dorsal/arxiv
View SchemaPolarization squeezing and continuous-variable polarization entanglement
| Authors | Natalia Korolkova, Gerd Leuchs, Rodney Loudon, Timothy C. Ralph, Christine Silberhorn |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0108098 |
| URL | https://arxiv.org/abs/quant-ph/0108098 |
| DOI | 10.1103/PhysRevA.65.052306 |
| Journal | Phys. Rev. A 65, 052306, (2002). |
Abstract
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. The use of pairs of primary polarization-squeezed light beams leads to substantially increased entanglement and to the generation of EPR-entangled light beams. 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.
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"abstract": "The Stokes-parameter operators and the associated Poincare sphere, which\ndescribe the quantum-optical polarization properties of light, are defined and\ntheir basic properties are reviewed. The general features of the Stokes\noperators are illustrated by evaluation of their means and variances for a\nrange of simple polarization states. Some of the examples show polarization\nsqueezing, in which the variances of one or more Stokes parameters are smaller\nthan the coherent-state value. The main object of the paper is the application\nof these concepts to bright squeezed light. It is shown that a light beam\nformed by interference of two orthogonally-polarized quadrature-squeezed beams\nexhibits squeezing in some of the Stokes parameters. Passage of such a primary\npolarization-squeezed beam through suitable optical components generates a pair\nof polarization-entangled light beams with the nature of a two-mode squeezed\nstate. The use of pairs of primary polarization-squeezed light beams leads to\nsubstantially increased entanglement and to the generation of EPR-entangled\nlight beams. The important advantage of these nonclassical polarization states\nfor quantum communication is the possibility of experimentally determining all\nof the relevant conjugate variables of both squeezed and entangled fields using\nonly linear optical elements followed by direct detection.",
"arxiv_id": "quant-ph/0108098",
"authors": [
"Natalia Korolkova",
"Gerd Leuchs",
"Rodney Loudon",
"Timothy C. Ralph",
"Christine Silberhorn"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.65.052306",
"journal_ref": "Phys. Rev. A 65, 052306, (2002).",
"title": "Polarization squeezing and continuous-variable polarization entanglement",
"url": "https://arxiv.org/abs/quant-ph/0108098"
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