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arXiv quant-ph/0204170quant-ph
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Laser驱动原子在多模腔中运动:腔冷却效率的强增强

Laser-driven atom moving in a multimode cavity: strong enhancement of cavity-cooling efficiency

Peter Domokos, Thomas Salzburger, Helmut Ritsch

摘要:

研究了横向相干抽运原子沿高Q腔轴运动的质心运动的腔介导冷却。强耦合到腔场的原子偶极的内部动力学处理的非微扰量子力学模型,而腔的外部运动的影响被描述经典的解析获得的线性摩擦和扩散系数。有效的腔诱导阻尼被发现,这导致稳态温度远低于多普勒限制。我们揭示了一个数学上的对称性的结果在这里和一个类似的系统,而不是原子,腔场泵浦。在简并多模腔中,冷却过程被强烈地增强。在特征冷却时间期间的温度和散射光子的数量都随着动态中所涉及的模式的数量的增加而显着减少。在大模简并条件下,一个冷却时间内的剩余自发发射数可以达到甚至低于单光子的极限。

英文摘要:

Cavity-mediated cooling of the center--of--mass motion of a transversally, coherently pumped atom along the axis of a high--Q cavity is studied. The internal dynamics of the atomic dipole strongly coupled to the cavity field is treated by a non-perturbative quantum mechanical model, while the effect of the cavity on the external motion is described classically in terms of the analytically obtained linear friction and diffusion coefficients. Efficient cavity-induced damping is found which leads to steady-state temperatures well-below the Doppler limit. We reveal a mathematical symmetry between the results here and for a similar system where, instead of the atom, the cavity field is pumped. The cooling process is strongly enhanced in a degenerate multimode cavity. Both the temperature and the number of scattered photons during the characteristic cooling time exhibits a significant reduction with increasing number of modes involved in the dynamics. The residual number of spontaneous emissions in a cooling time for large mode degeneracy can reach and even drop below the limit of a single photon.

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