非经典光增强光电流
Enhancing photoelectric current by nonclassical light
摘要：
利用非经典光子统计理论研究了驱动光产生的光电流。由于输入光子的非经典统计特性，将驱动光视为经典物理中的平面波已经不够了。我们用量子方法研究了这类问题，发现：当驱动光从一个相干态出发作为初始态时，我们的量子处理很好地恢复了准经典驱动描述;当驾驶灯是具有某个P函数的一般状态时，整个系统动态可以被简化为许多“分支”的P函数平均--在每个动态分支中，驱动光从相干态开始，因此系统动力学可以再次以上述准经典方式获得。基于这种量子方法，事实证明不同的光子统计确实会对光电流产生影响。在所有具有相同光强的经典光态中，我们证明了具有泊松统计的输入光产生的光电流最大，而非经典亚泊松光可以超过这个经典上界.
英文摘要：
We study the photoelectric current generated by a driving light with nonclassical photon statistics. Due to the nonclassical input photon statistics, it is no longer enough to treat the driving light as a planar wave as in classical physics. We make a quantum approach to study such problems, and find that: when the driving light starts from a coherent state as the initial state, our quantum treatment well returns the quasi-classical driving description; when the the driving light is a generic state with a certain P function, the full system dynamics can be reduced as the P function average of many "branches" -- in each dynamics branch, the driving light starts from a coherent state, thus again the system dynamics can be obtained in the above quasi-classical way. Based on this quantum approach, it turns out the different photon statistics does make differences to the photoelectric current. Among all the classical light states with the same light intensity, we prove that the input light with Poisson statistics generates the largest photoelectric current, while a nonclassical sub-Poisson light could exceed this classical upper bound.
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