Feedback Cooling of the Normal Modes of a Massive Electromechanical System to Submillikelvin Temperature - INSPIRE

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Feedback Cooling of the Normal Modes of a Massive Electromechanical System to Submillikelvin Temperature

Mar 4, 2008

4 pages

Published in:

Phys.Rev.Lett. 101 (2008) 3, 033601

e-Print:

0803.0470 [quant-ph]

DOI:

10.1103/PhysRevLett.101.033601

Experiments:

AURIGA

View in:

ADS Abstract Service

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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.

Note:

4 pages, 4 figures

interference: quantum
feedback
gravitational radiation detector
superconductivity
amplifier
cryogenics

References(25)

Figures(0)

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