Coherent control of broadband vacuum squeezing

Simon Chelkowski, Henning Vahlbruch, Karsten Danzmann, and Roman Schnabel
Phys. Rev. A 75, 043814 – Published 23 April 2007

Abstract

We present the observation of optical fields carrying squeezed vacuum states at sideband frequencies from 10Hz to above 35MHz. The field was generated with type-I optical parametric oscillation below threshold at 1064nm. A coherent, unbalanced classical modulation field at 40MHz enabled the generation of error signals for stable phase control of the squeezed vacuum field with respect to a strong local oscillator. Broadband squeezing of approximately 4dB was measured with balanced homodyne detection. The spectrum of the squeezed field allows a quantum noise reduction of ground-based gravitational wave detectors over their full detection band, regardless of whether homodyne readout or radio-frequency heterodyne readout is used.

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  • Received 18 October 2006

DOI:https://doi.org/10.1103/PhysRevA.75.043814

©2007 American Physical Society

Authors & Affiliations

Simon Chelkowski, Henning Vahlbruch, Karsten Danzmann, and Roman Schnabel

  • Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut) and Institut für Gravitationsphysik, Leibniz Universität Hannover, Callinstrasse 38, 30167 Hannover, Germany

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Issue

Vol. 75, Iss. 4 — April 2007

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