Quantum dynamics of a mechanical resonator driven by a cavity
Quantum dynamics of a mechanical resonator driven by a cavity
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DOI：
10.1016/j.crhy.2012.03.006
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发表时间：
2012-06-01
影响因子：
1.4
通讯作者：
Rodrigues, Denzil A.
中科院分区：
文献类型：
--
作者：
Armour, Andrew D.;Rodrigues, Denzil A.
我们探讨的量子力学的机械谐振器的位置是耦合到一个光学（或微波）腔模式的频率。当以高于谐振的频率驱动腔时，机械谐振器可以获得能量，并且对于足够强的耦合，这导致极限环振荡。使用截断的维格纳函数的方法，它捕获系统中的零点波动，我们开发了一个近似的分析处理的谐振器动力学的极限环制度。我们发现，由腔产生的极限环振荡与谐振器中的能量波动相当低的水平。与在相同温度下由纯谐波驱动驱动到给定平均能量的谐振器相比，腔驱动振荡可以具有低得多的能量波动。此外，在足够低的温度下，腔可以驱动谐振器进入非经典状态，这是数字压缩。(C)2012年科学院。由Elsevier Masson SAS出版。All rights reserved.
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. (C) 2012 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.