Feedback Cooling of the Normal Modes of a Massive Electromechanical System to Submillikelvin Temperature
Andrea Vinante,M. Bignotto,Michele Bonaldi,Massimo Cerdonio,L. Conti,Paolo Falferi,N. Liguori,Stefano Longo,Renato Mezzena,Antonello Ortolan,G. A. Prodi,F. Salemi,L. Taffarello,G. Vedovato,Stefano Vitale,J. P. Zendri +15 more
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TLDR
A feedback cooling technique applied to simultaneously cool the three electromechanical normal modes of the ton-scale resonant-bar gravitational wave detector AURIGA could allow to approach the quantum ground state of a kilogram-scale mechanical resonator.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.read more
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