NCTS (South)


DATE2013-05-06

TIME12:00

PLACER49223, Second Physics Building , NCKU

FIELDQuantum Information Science

SPEAKER Dr. Po-Wen Chen(陳柏文) - Department of Physics, NTU

TITLEQuantum theory of cavity-assisted sideband cooling of micromechanical oscillator to its quantum ground state

ABSTRACTWe provide a theoretical analysis to describe cooling of micromechanical oscillator to its quantum ground state with driven optical cavity using radiation pressure coupling in appropriately detuned cavity mode (cavity-assisted sideband). We evaluate the non-Markovian two-time correlations (CF’s) of micromechanical displacement by the exactly Heisenberg-Langevin equation of motion through fluctuation-dissipation theorem. In general non-equilibrium fluctuation-noise can be assigned a unique effective temperature Teff [ω] for the noise which provides a definition of effective average phonon occupation number eff. However, in order to get to quantum ground state which eff find that minimize in this case of specific parameter regimes.