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arXiv 1607.07941physics.atom-phphysics.opticsquant-ph
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集体原子自旋振子的腔辅助测量和相干控制

Cavity-assisted measurement and coherent control of collective atomic spin oscillators

Jonathan Kohler, Nicolas Spethmann, Sydney Schreppler, Dan M. Stamper-Kurn

备注：
5 pages, 4 figures, and supplemental material
发表信息：
Phys. Rev. Lett. 118, 063604 (2017)
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摘要：

我们演示了在高精细度光学腔中对经历拉莫尔进动的原子系综集体自旋的连续测量和相干控制。旋进自旋与腔场的耦合产生类似于在腔光力学中观察到的现象，包括腔放大、阻尼和光学弹簧位移。这些效应来自于原子自旋动力学的自主光反馈，受腔谱的制约。我们使用这种反馈来稳定自旋在其高或低能量状态，其中，在平衡与测量反作用加热，它实现了稳态温度，由斯托克斯和反斯托克斯散射率之间的不对称性表示。对于足够大的拉莫尔频率，这样的反馈稳定的自旋系综在一个接近纯量子态，尽管连续测量的腔场。

英文摘要：

We demonstrate continuous measurement and coherent control of the collective spin of an atomic ensemble undergoing Larmor precession in a high-finesse optical cavity. The coupling of the precessing spin to the cavity field yields phenomena similar to those observed in cavity optomechanics, including cavity amplification, damping, and optical spring shifts. These effects arise from autonomous optical feedback onto the atomic spin dynamics, conditioned by the cavity spectrum. We use this feedback to stabilize the spin in either its high- or low-energy state, where, in equilibrium with measurement back-action heating, it achieves a steady-state temperature, indicated by an asymmetry between the Stokes and anti-Stokes scattering rates. For sufficiently large Larmor frequency, such feedback stabilizes the spin ensemble in a nearly pure quantum state, in spite of continuous measurement by the cavity field.

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