Abstract
Optical interferometry is by far the most sensitive displacement measurement technique available, with sensitivities at the level in the large-scale gravitational-wave interferometers currently in operation. Second-generation interferometers will experience a tenfold improvement in sensitivity and be mainly limited by quantum noise, close to the standard quantum limit (SQL), once considered as the ultimate displacement sensitivity achievable by interferometry. In this Letter, we experimentally demonstrate one of the techniques envisioned to go beyond the SQL: amplification of a signal by radiation-pressure backaction in a detuned cavity.
- Received 20 December 2009
DOI:https://doi.org/10.1103/PhysRevLett.104.133602
©2010 American Physical Society
Synopsis
Turning backaction around
Published 2 April 2010
Signal amplification in an optical interferometer may push the sensitivity of measurements beyond the standard quantum limit.
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