Zhdanovich S, Shapiro E A, Shapiro M, Hepburn J W, Milner V
Department of Physics, The University of British Columbia, Vancouver, Canada.
Phys Rev Lett. 2008 Mar 14;100(10):103004. doi: 10.1103/PhysRevLett.100.103004. Epub 2008 Mar 13.
We propose and experimentally demonstrate the method of population transfer by piecewise adiabatic passage between two quantum states. Coherent excitation of a two-level system with a train of ultrashort laser pulses is shown to reproduce the effect of an adiabatic passage, conventionally achieved with a single frequency-chirped pulse. By properly adjusting the amplitudes and phases of the pulses in the excitation pulse train, we achieve complete and robust population transfer to the target state. The piecewise nature of the process suggests a possibility for the selective population transfer in complex quantum systems.
我们提出并通过实验证明了在两个量子态之间通过分段绝热通道实现粒子数转移的方法。用一列超短激光脉冲对二能级系统进行相干激发，结果表明可以重现传统上用单个频率啁啾脉冲实现的绝热通道效应。通过适当调整激发脉冲序列中各脉冲的幅度和相位，我们实现了向目标态的完全且稳健的粒子数转移。该过程的分段性质为复杂量子系统中的选择性粒子数转移提供了一种可能性。
