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Phys. Rev. B 76, 205302 (2007) [6 pages]

Cooling a micromechanical beam by coupling it to a transmission line

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Fei Xue1,2, Y. D. Wang3, Yu-xi Liu1,2, and Franco Nori1,2,4
1CREST, Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332-0012, Japan
2Frontier Research System, The Institute of Physical and Chemical Research (RIKEN), Wako-shi, Saitama 351-0198, Japan
3NTT Basic Research Laboratories, NTT Corporation, Atsugi-shi, Kanagawa 243-0198, Japan
4Center for Theoretical Physics, Physics Department and Center for the Study of Complex Systems, The University of Michigan, Ann Arbor, Michigan 48109-1040, USA

Received 21 June 2007; revised 4 October 2007; published 1 November 2007

We study a method to cool down the vibration mode of a micromechanical beam using a capacitively coupled superconducting transmission line. The Coulomb force between the transmission line and the beam is determined by the driving microwave on the transmission line and the displacement of the beam. When the frequency of the driving microwave is smaller than that of the transmission line resonator, the Coulomb force can oppose the velocity of the beam. Thus, the beam can be cooled. This mechanism, which may enable us to prepare the beam in its quantum ground state of vibration, is feasible under current experimental conditions.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.76.205302
DOI:
10.1103/PhysRevB.76.205302
PACS:
85.85.+j, 45.80.+r
 
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