A room temperature optomechanical squeezer
- URL: http://arxiv.org/abs/2006.14323v1
- Date: Thu, 25 Jun 2020 11:56:34 GMT
- Title: A room temperature optomechanical squeezer
- Authors: Nancy Aggarwal
- Abstract summary: One of the noise sources that currently limits gravitational wave (GW) detectors comes from the quantum nature of the light causing uncertain amplitude and phase.
GW detectors plan to use squeezed light injection to lower this quantum noise.
I focus on using radiation-pressure-mediated optomechanical (OM) interaction to generate squeezed light.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: One of the noise sources that currently limits gravitational wave (GW)
detectors comes from the quantum nature of the light causing uncertain
amplitude and phase. Phase uncertainty limits the precision of an
interferometric measurement. This measurement is also subject to quantum
back-action, caused by the radiation pressure force fluctuations produced by
the amplitude uncertainty (QRPN). In order to lower this quantum noise, GW
detectors plan to use squeezed light injection. In this thesis, I focus on
using radiation-pressure-mediated optomechanical (OM) interaction to generate
squeezed light. Creating squeezed states by using OM interaction enables
wavelength-independent squeezed light sources that may also be more compact and
robust than traditionally used non-linear crystals. We analyze the system with
realistic imperfections (losses & classical noise), and use the concepts to
design an experiment to obtain the most possible squeezing in a broad
audio-frequency band at room temperature. This involves an optimization for the
optical properties of the cavity and the mechanical properties of the
oscillator. We then show its experimental implementation, and subsequent
observation of QRPN as well as OM squeezing. These are the first ever direct
observations of a room temperature oscillator's motion being overwhelmed by
vacuum fluctuations. This is shown in the low frequency band, which is relevant
to GW detectors, but poses its own technical challenges, and hence has not been
done before. Being in the back-action dominated regime along with optimized
optical properties has also enabled us to observe OM squeezing. That is the
first direct observation of quantum noise suppression in a room temperature OM
system. It is also the first direct evidence of quantum correlations in the
audio frequency band, in a broad band at non-resonant frequencies.
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