Coherent Control of Vacuum Squeezing in the Gravitational-Wave Detection Band

Henning Vahlbruch, Simon Chelkowski, Boris Hage, Alexander Franzen, Karsten Danzmann, and Roman Schnabel
Phys. Rev. Lett. 97, 011101 – Published 6 July 2006

Abstract

We propose and demonstrate a coherent control scheme for stable phase locking of squeezed vacuum fields. We focus on sideband fields at frequencies from 10 Hz to 10 kHz, which is a frequency regime of particular interest in gravitational-wave detection and for which conventional control schemes have failed so far. A vacuum field with broadband squeezing covering this entire band was produced using optical parametric oscillation and characterized with balanced homodyne detection. The system was stably controlled over long periods utilizing two coherent but frequency shifted control fields. In order to demonstrate the performance of our setup the squeezed field was used for a nonclassical sensitivity improvement of a Michelson interferometer at audio frequencies.

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  • Received 5 April 2006

DOI:https://doi.org/10.1103/PhysRevLett.97.011101

©2006 American Physical Society

Authors & Affiliations

Henning Vahlbruch, Simon Chelkowski, Boris Hage, Alexander Franzen, Karsten Danzmann, and Roman Schnabel

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

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Issue

Vol. 97, Iss. 1 — 7 July 2006

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