Feedback cooling of the normal modes of a massive electromechanical system to submillikelvin temperature.
Phys Rev Lett
; 101(3): 033601, 2008 Jul 18.
Article
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| MEDLINE
| ID: mdl-18764254
ABSTRACT
We apply a feedback cooling technique to simultaneously cool the three electromechanical normal modes of the ton-scale resonant-bar gravitational wave detector AURIGA. The measuring system is based on a dc superconducting quantum interference device (SQUID) amplifier, and the feedback cooling is applied electronically to the input circuit of the SQUID. Starting from a bath temperature of 4.2 K, we achieve a minimum temperature of 0.17 mK for the coolest normal mode. The same technique, implemented in a dedicated experiment at subkelvin bath temperature and with a quantum limited SQUID, could allow to approach the quantum ground state of a kilogram-scale mechanical resonator.
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MEDLINE
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En
Revista:
Phys Rev Lett
Año:
2008
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Article
País de afiliación:
Italia