Quantum dynamics of a mechanical resonator driven by a cavity
详细信息 查看全文
- 作者：Andrew D. Armour ; andrew.armour@nottingham.ac.uk ; Denzil A. Rodrigues
- 关键词：Quantum dynamics ; Mechanical resonator ; Optomechanical systems
- 刊名：Comptes Rendus Physique
- 出版年：2012
- 出版时间：June, 2012
- 年：2012
- 卷：13
- 期：5
- 页码：440-453
- 全文大小：364 K
文摘
We explore the quantum dynamics of a mechanical resonator whose position is coupled to the frequency of an optical (or microwave) cavity mode. When the cavity is driven at a frequency above resonance the mechanical resonator can gain energy and for sufficiently strong coupling this results in limit-cycle oscillations. Using a truncated Wigner function approach, which captures the zero-point fluctuations in the system, we develop an approximate analytic treatment of the resonator dynamics in the limit-cycle regime. We find that the limit-cycle oscillations produced by the cavity are associated with rather low levels of energy fluctuations in the resonator. Compared to a resonator at the same temperature which is driven by a pure harmonic drive to a given average energy, the cavity-driven oscillations can have much lower energy fluctuations. Furthermore, at sufficiently low temperatures, the cavity can drive the resonator into a non-classical state which is number-squeezed.