Feedback cooling of the normal modes of a massive electromechanical system to submillikelvin temperature |
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| Authors: | Vinante A Bignotto M Bonaldi M Cerdonio M Conti L Falferi P Liguori N Longo S Mezzena R Ortolan A Prodi G A Salemi F Taffarello L Vedovato G Vitale S Zendri J-P |
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| Institution: | Istituto di Fotonica e Nanotecnologie, CNR-Fondazione Bruno Kessler, 38100 Povo, Trento, Italy. vinante@science.unitn.it |
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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. |
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