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Cooling a nanomechanical resonator with quantum back-action

Naik, A. and Buu, O. and LaHaye, M. D. and Armour, A. D. and Clerk, A. A. and Blencowe, M. P. and Schwab, K. C. (2006) Cooling a nanomechanical resonator with quantum back-action. Nature, 443 (7108). pp. 193-196. ISSN 0028-0836.

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Quantum mechanics demands that the act of measurement must affect the measured object. When a linear amplifier is used to continuously monitor the position of an object, the Heisenberg uncertainty relationship requires that the object be driven by force impulses, called back-action. Here we measure the back-action of a superconducting single-electron transistor (SSET) on a radio-frequency nanomechanical resonator. The conductance of the SSET, which is capacitively coupled to the resonator, provides a sensitive probe of the latter's position; back-action effects manifest themselves as an effective thermal bath, the properties of which depend sensitively on SSET bias conditions. Surprisingly, when the SSET is biased near a transport resonance, we observe cooling of the nanomechanical mode from 550 mK to 300 mK—an effect that is analogous to laser cooling in atomic physics. Our measurements have implications for nanomechanical readout of quantum information devices and the limits of ultrasensitive force microscopy (such as single-nuclear-spin magnetic resonance force microscopy). Furthermore, we anticipate the use of these back-action effects to prepare ultracold and quantum states of mechanical structures, which would not be accessible with existing technology.

Item Type:Article
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URLURL TypeDescription ReadCube access Paper
Clerk, A. A.0000-0001-7297-9068
Schwab, K. C.0000-0001-8216-4815
Alternate Title:Cooper-Pair Molasses - Cooling a Nanomechanical Resonator with Quantum Back-Action
Additional Information:© 2006 Nature Publishing Group. Received 17 February; accepted 30 June 2006. We thank A. Rimberg and A. Vandaley for discussions, and B. Camarota for assistance with the fabrication of the samples. M.P.B. is supported by the NSF through an NIRT grant, A.D.A. is supported by the EPSRC, and A.A.C. is supported by NSERC. Author Contributions: A.N. and O.B. contributed equally to this work. Supplementary Information is linked to the online version of the paper at
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Engineering and Physical Sciences Research Council (EPSRC)UNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Issue or Number:7108
Record Number:CaltechAUTHORS:20090911-092251882
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:15763
Deposited By: George Porter
Deposited On:02 Oct 2009 18:13
Last Modified:09 Mar 2020 13:18

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