Feedback cooling of cantilever motion using a quantum point contact transducer
arXiv:1207.5006 · doi:10.1063/1.4754606
Abstract
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^(-11) m/Hz^(1/2) are limited by the performance of the QPC as a one-dimensional conductor and by the cantilever-QPC capacitive coupling.
5 pages, 4 figures
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- Force-linearization closure for non-Markovian Langevin systems with time delay
- Heat fluctuations for underdamped Langevin dynamics
- Dissipative versus Conditional Generation of Gaussian Entanglement and Spin Squeezing
- Frequency thermal response and cooling performance in a microscopic system with a time-dependent perturbation