Observation of a kilogram-scale oscillator near its quantum ground state

, LIGO Scientific Collaboration (2009) Observation of a kilogram-scale oscillator near its quantum ground state. New Journal of Physics, 11 (7). ISSN 1367-2630

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Abstract

We introduce a novel cooling technique capable of approaching the quantum ground state of a kilogram-scale system—an interferometric gravitational wave detector. The detectors of the Laser Interferometer Gravitational-wave Observatory (LIGO) operate within a factor of 10 of the standard quantum limit (SQL), providing a displacement sensitivity of 10−18 m in a 100 Hz band centered on 150 Hz. With a new feedback strategy, we dynamically shift the resonant frequency of a 2.7 kg pendulum mode to lie within this optimal band, where its effective temperature falls as low as 1.4 μK, and its occupation number reaches about 200 quanta. This work shows how the exquisite sensitivity necessary to detect gravitational waves can be made available to probe the validity of quantum mechanics on an enormous mass scale.

Item Type:
Journal Article
Journal or Publication Title:
New Journal of Physics
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100
Subjects:
ID Code:
136169
Deposited By:
Deposited On:
19 Aug 2019 08:35
Refereed?:
Yes
Published?:
Published
Last Modified:
18 Nov 2020 07:00