期刊
SCIENCE
卷 320, 期 5876, 页码 638-643出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1154576
关键词
-
Manipulation of quantum interference requires that the system under control remains coherent, avoiding ( or at least postponing) the phase randomization that can ensue from coupling to an uncontrolled environment. We show that closed- loop coherent control can be used to mitigate the rate of quantum dephasing in a gas- phase ensemble of potassium dimers ( K-2), which acts as a model system for testing the general concepts of controlling decoherence. Specifically, we adaptively shaped the light pulse used to prepare a vibrational wave packet in electronically excited K-2, with the amplitude of quantum beats in the fluorescence signal used as an easily measured surrogate for the purpose of optimizing coherence. The optimal pulse increased the beat amplitude from below the noise level to well above it, and thereby increased the coherence life time as compared with the beats produced by a transform- limited pulse. Closed- loop methods can thus effectively identify states that are robust against dephasing without any previous information about the system- environment interaction.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据