A resonator with eigenfrequency ωr can be effectively used as a cooler for another linear oscillator with a much smaller frequency ωm ωr. A huge cooling effect, which could be used to cool a mechanical oscillator below the energy of quantum fluctuations, has been predicted by several authors. However, here we show that there is a lower limit T on the achievable temperature, given by T = Tm ωm / ωr, that was not considered in previous work and can be higher than the quantum limit in realistic experimental realizations. We also point out that the decay rate of the resonator, which previous studies stress should be small, must be larger than the decay rate of the cooled oscillator for effective cooling.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 3 Jul 2008|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics