受驱转子中高阶量子共振的观测
Observation of high-order quantum resonances in the kicked rotor.
作者信息
Kanem J F, Maneshi S, Partlow M, Spanner M, Steinberg A M
机构信息
Centre for Quantum Information & Quantum Control, University of Toronto, 60 St. George Street, Toronto, Ontario, Canada M5S 1A7.
出版信息
Phys Rev Lett. 2007 Feb 23;98(8):083004. doi: 10.1103/PhysRevLett.98.083004.
Quantum resonances in the kicked rotor are characterized by a dramatically increased energy absorption rate, in stark contrast to the momentum localization generally observed. These resonances occur when the scaled Planck's constant Planck's [over ]=r/s 4pi, for any integers r and s. However, only the variant Planck's [over ]=r2pi resonances are easily observable. We have observed high-order quantum resonances (s>2) utilizing a sample of low energy, noncondensed atoms and a pulsed optical standing wave. Resonances are observed for variant Planck's [over ]=r/16 4pi for integers r=2-6. Quantum numerical simulations suggest that our observation of high-order resonances indicate a larger coherence length (i.e., coherence between different wells) than expected from an initially thermal atomic sample.
受驱转子中的量子共振的特征是能量吸收率显著提高，这与通常观察到的动量局域化形成鲜明对比。当缩放后的普朗克常数 $\hbar = r/s\times4\pi$（其中 $r$ 和 $s$ 为任意整数）时，会出现这些共振。然而，只有 $\hbar = r/2\pi$ 的共振变体易于观测到。我们利用低能、非凝聚原子样本和脉冲光学驻波观测到了高阶量子共振（$s>2$）。对于整数 $r = 2 - 6$，观测到了 $\hbar = r/16\times4\pi$ 的共振变体。量子数值模拟表明，我们对高阶共振的观测表明，其相干长度（即不同势阱之间的相干性）比初始热原子样本预期的要大。
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