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arXiv 0709.0754physics.atom-ph
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囚禁玻色子的相干控制

Coherent Control of Trapped Bosons

Analabha Roy, Linda E. Reichl

摘要:

研究了碱金属原子数压缩超冷气体产生的介观双玻色子系统的量子行为。波函数的量子庞加莱映射在相空间的那些区域受到混沌的影响,在这些区域中,经典动力学产生的特征与hbar相当。我们还研究了在这些系统中的激发动力学量子控制的可能性。受控激发由脉冲信号介导,该脉冲信号引起从基态到更高能量状态的受激拉曼绝热通道(STIRAP)。这种转变的动力学受到相空间某些区域中脉冲引起的混沌的影响。因此,向混沌的过渡可以提供控制STIRAP的方法。

英文摘要:

We investigate the quantum behavior of a mesoscopic two-boson system produced by number-squeezing ultracold gases of alkali metal atoms. The quantum Poincare maps of the wavefunctions are affected by chaos in those regions of the phase space where the classical dynamics produces features that are comparable to hbar. We also investigate the possibility for quantum control in the dynamics of excitations in these systems. Controlled excitations are mediated by pulsed signals that cause Stimulated Raman Adiabatic passage (STIRAP) from the ground state to a state of higher energy. The dynamics of this transition is affected by chaos caused by the pulses in certain regions of the phase space. A transition to chaos can thus provide a method of controlling STIRAP.

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