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Optics and Spectroscopy

, Volume 94, Issue 5, pp 651–665 | Cite as

Optical experiments beyond the quantum limit: Squeezing, entanglement, and teleportation

  • R. Schnabel
  • W. P. Bowen
  • N. Treps
  • B. Buchler
  • T. C. Ralph
  • P. K. Lam
  • H. -A. Bachor
Entangled States in Optics

Abstract

Results of experiments recently performed are reported, in which two optical parametric amplifiers were set up to generate two independently quadrature squeezed continuous wave laser beams. The transformation of quadrature squeezed states into polarization squeezed states and into states with spatial quantum correlations is demonstrated. By utilizing two squeezed laser beams, a polarization squeezed state exhibiting three simultaneously squeezed Stokes operator variances was generated. Continuous variable polarization entanglement was generated and the Einstein-Podolsky-Rosen paradox was observed. A pair of Stokes operators satisfied both the inseparability criterion and the conditional variance criterion. Values of 0.49 and 0.77, respectively, were observed, with entanglement requiring values below unity. The inseparability measure of the observed quadrature entanglement was 0.44. This value is sufficient for a demonstration of quantum teleportation, which is the next experimental goal of the authors.

Keywords

Second Harmonic Generator Shot Noise Quantum Noise Stokes Parameter Polarize Beam Splitter 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© MAIK "Nauka/Interperiodica" 2003

Authors and Affiliations

  • R. Schnabel
    • 1
    • 2
  • W. P. Bowen
    • 1
  • N. Treps
    • 1
  • B. Buchler
    • 1
  • T. C. Ralph
    • 3
  • P. K. Lam
    • 1
  • H. -A. Bachor
    • 1
  1. 1.Department of Physics, Faculty of ScienceAustralian National UniversityAustralia
  2. 2.Albert-Einstein-InstitutUniversität HannoverHannoverGermany
  3. 3.Department of Physics, Centre for LasersUniversity of QueenslandSt. LuciaAustralia

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