Optical and Quantum Electronics

, Volume 24, Issue 3, pp 285–301 | Cite as

Squeezed states in direct and coherent detection

  • V. Annovazzi-Lodi
  • S. Donati
  • S. Merlo
Papers

Abstract

With reference to squeezed states, we analyse the noise performances of the basic detection schemes in fibre telecommunications and interferometry. We have developed a semiclassical approach that allows us to translate the quantum mechanical formalism into synthetic expressions and rules only involving directly measurable physical quantities. As a result, we find that in the telecommunication field squeezed states do not allow significant improvements in system performances: in practice, the signal-to-noise ratio cannot be increased in standard detection schemes, both direct and coherent, by squeezing either the signal (because of propagation losses) or by the local oscillator. On the contrary, a significant improvement can be obtained in interferometric measurements if squeezed vacuum is coupled into the normally unused beamsplitter port.

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Copyright information

© Chapman & Hall 1992

Authors and Affiliations

  • V. Annovazzi-Lodi
    • 1
  • S. Donati
    • 1
  • S. Merlo
    • 1
  1. 1.Dipartimento di ElettronicaUniversità di PaviaPaviaItaly

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