Applied Physics B

, Volume 64, Issue 2, pp 203–212 | Cite as

Continuous-wave quantum nondemolition measurements with vacuum and nonclassical meter input

  • R. Bruckmeier
  • K. Schneider
  • H. Hansen
  • M. Schalke
  • S. Schiller
  • J. Mlynek

Abstract.

QND measurements of the amplitude quadrature of continuous-wave light are performed with a monolithic dual-port degenerate optical parametric amplifier (OPA). Operated with a vacuum meter input, both output beams are squeezed and 33% correlated, demonstrating individually squeezed twin beams. The sum of the signal and meter transfer coefficients is 1.05, demonstrating operation as a quantum optical tap. The device exhibits quantum state preparation ability for both signal and meter output, reaching the conditional variances of \(-0.8\) dB and \(-2.5\) dB, respectively. An improved quantum measurement is realized by injecting 3.4 dB amplitude-squeezed light into the meter input port of the OPA. This achieves increased correlation and squeezing of the output beams, and both improved operation as a quantum optical tap and as a quantum state preparator. The all-solid-state system was operated for up to 5 hours with high stability.

PACS:42.50-p 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1997

Authors and Affiliations

  • R. Bruckmeier
    • 1
  • K. Schneider
    • 1
  • H. Hansen
    • 1
  • M. Schalke
    • 1
  • S. Schiller
    • 1
  • J. Mlynek
    • 1
  1. 1.Fakultät für Physik, Universität Konstanz, D-78434 Konstanz, Germany (Fax: +49 7531/883072, E-mail: robert.bruckmeier@uni-konstanz.de, http: //quantum-optics.physik.uni-konstanz.de)DE

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