Ground-state cooling of a dispersively coupled optomechanical system in the unresolved sideband regime via a dissipatively coupled oscillator

Abstract

In the optomechanical cooling of a dispersively coupled oscillator, it is only possible to reach the oscillator ground state in the resolved sideband regime, where the cavity-mode line width is smaller than the resonant frequency of the mechanical oscillator being cooled. In this paper, we show that the dispersively coupled system can be cooled to the ground state in the unresolved sideband regime using an ancillary oscillator, which is coupled to the same optical mode via dissipative interaction. The ancillary oscillator has a resonant frequency close to that of the target oscillator; thus, the ancillary oscillator is also in the unresolved sideband regime. We require only a single blue-detuned laser mode to drive the cavity.

Quantum optomechanical transducer with ultrashort pulses

“…We assume the optical decay rate κ to be much larger than other characteristic rates of the system-inverse pulse duration τ −1 , mechanical frequency ω m and the enhanced optomechanical coupling strength kt g N 4 which is well justified in certain experiments [46,47]. This corresponds to the adiabatic regime where the optical mode reacts instantaneously to influences.…”

Improving the Performance of Cooling and Entanglement in a Double Cavity Optomechanical System Assisted by the Quantum Coherent Feedback

“…However, this mechanism intensively depends on the resolved sideband regime, i.e., the cavity linewidth needs to be far beyond the mechanical resonance. Evading such restriction, one wellregarded approach is to structure the hybrid optomechanical system (OMS), where an introduced auxiliary quantum element, e.g., atomic ensemble, [19,20] high quality cavity, [21,22] and extra mechanical mode, [23][24][25] induces the quantum noise interference around the Stokes sideband and thus the quantum backaction heating can be effectively resisted even at a large cavity linewidth. Similar tailoring mechanism can also be achieved by injection of squeezed light [26] or intracavity squeezing.…”

Energy-localization-enhanced ground-state cooling of a mechanical resonator from room temperature in optomechanics using a gain cavity

“…However, the first method is difficult to be extended to all types of standard optomechanical systems. Thus, various approaches have been proposed to improve the cooling rate, e.g., cooling in the strong coupling regime [62,63], hybrid cooling with atomic systems [64][65][66][67][68][69][70][71] or artificial atoms [72][73][74], cooling by electromagneticallyinduced-transparency [75][76][77], squeezed optical fields [78][79][80], dark mode interaction [82,83], dissipative optomechanical coupling [84][85][86][87][88][89][90][91][92][93][94], pulsed excitation [95][96][97][98][99][100], spontaneous Brillouin scattering [101,102], cavity polaritons [103][104][105][106], and Non-Markovian evolution [107,108]. Unfortunately, the phonon coolin...…”