Feedback cooling of the normal modes of a massive electromechanical system to submillikelvin temperature

Details Feedback cooling of the normal modes of a massive electromechanical system to submillikelvin temperature Feedback cooling of the normal modes of a massive electromechanical system to submillikelvin temperature

2008-03-04

arxiv.org/abs/0803.0470v3

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

Physics

Quantum Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.101.033601

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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