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arXiv 1606.09007quant-ph
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利用压缩光抑制Stokes散射和改善光机冷却

Suppression of Stokes scattering and improved optomechanical cooling with squeezed light

Muhammad Asjad, Stefano Zippilli, David Vitali

摘要:

我们发展了一个压缩输入光场的光机冷却理论。我们表明,斯托克斯加热跃迁可以抑制\emph{fully}时,驱动场被压缩低于真空噪声水平在适当选择的压缩相位和有限的压缩量。因此,对激光冷却的量子反作用极限可以降低到零,并且所得到的最终温度然后仅由热声子数与光机械协同性参数之间的比率确定,而与腔线宽和机械频率的实际值无关。因此,用压缩输入场驱动允许制备纳米机械谐振器,即使具有低谐振频率,在它们的量子基态中具有非常接近1的保真度。

英文摘要:

We develop a theory of optomechanical cooling with a squeezed input light field. We show that Stokes heating transitions can be \emph{fully} suppressed when the driving field is squeezed below the vacuum noise level at an appropriately selected squeezing phase and for a finite amount of squeezing. The quantum backaction limit to laser cooling can be therefore moved down to zero and the resulting final temperature is then solely determined by the ratio between the thermal phonon number and the optomechanical cooperativity parameter, independently of the actual values of the cavity linewidth and mechanical frequency. Therefore driving with a squeezed input field allows to prepare nanomechanical resonators, even with low resonance frequency, in their quantum ground state with a fidelity very close to one.

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