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Phys. Rev. Lett. 101, 033601 (2008) [4 pages]

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

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A. Vinante1,2,*, M. Bignotto3,4, M. Bonaldi1,2, M. Cerdonio3,4, L. Conti3,4, P. Falferi1,2, N. Liguori3,4, S. Longo5, R. Mezzena6,2, A. Ortolan5, G. A. Prodi6,2, F. Salemi6,2, L. Taffarello4, G. Vedovato4, S. Vitale6,2, and J.-P. Zendri4
1Istituto di Fotonica e Nanotecnologie, CNR-Fondazione Bruno Kessler, 38100 Povo, Trento, Italy
2INFN, Gruppo Collegato di Trento, Sezione di Padova, 38100 Povo, Trento, Italy
3Dipartimento di Fisica, Università di Padova, 35131 Padova, Italy
4INFN, Sezione di Padova, 35131 Padova, Italy
5INFN, Laboratori Nazionali di Legnaro, 35020 Legnaro, Padova, Italy
6Dipartimento di Fisica, Università di Trento, 38100 Povo, Trento, Italy

Received 3 March 2008; published 14 July 2008

See accompanying Physics Viewpoint

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.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.033601
DOI:
10.1103/PhysRevLett.101.033601
PACS:
42.50.Lc, 04.80.Nn, 05.40.−a, 45.80.+r

*vinante@science.unitn.it

 
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