Feedback cooling of cantilever motion using a quantum point contact transducer
- Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel (Switzerland)
- Center for Spintronics and Quantum Computation, University of California, Santa Barbara, California 93106 (United States)
We use a quantum point contact (QPC) as a displacement transducer to measure and control the low-temperature thermal motion of a nearby micromechanical cantilever. The QPC is included in an active feedback loop designed to cool the cantilever's fundamental mechanical mode, achieving a squashing of the QPC noise at high gain. The minimum achieved effective mode temperature of 0.2 K and the displacement resolution of 10{sup -11} m/{radical}(Hz) are limited by the performance of the QPC as a one-dimensional conductor and by the cantilever-QPC capacitive coupling.
- OSTI ID:
- 22080464
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 13 Vol. 101; ISSN APPLAB; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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