利用超快脉冲整形抑制泄漏
Leakage suppression by ultrafast pulse shaping
摘要：
我们考虑一个三能级系统的泄漏抑制问题，其中前两个能级是量子比特系统，第三个能级与第二个能级弱耦合，是泄漏态。我们表明，相位和幅度控制的两（三）个脉冲是足够的任意量子比特控制从地面（任意）初始状态，泄漏抑制到一阶扰动，而无需额外的脉冲面积成本。利用整形飞秒光脉冲和铷原子进行了原理验证实验，实验结果与理论吻合较好。
英文摘要：
We consider the leakage suppression problem of a three-level system in which the first two levels are the qubit system and the third, weakly-coupled to the second, is the leakage state. We show that phase- and amplitude-controlled two (three) pulses are sufficient for arbitrary qubit controls from the ground (an arbitrary) initial state, with leakage suppressed up to the first order of perturbation without additional pulse-area cost. A proof-of-principle experiment was performed with shaped femtosecond optical pulses and atomic rubidium showing a good agreement with the theory.
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