Generation of ultraviolet entangled photons in a semiconductor
Generation of ultraviolet entangled photons in a semiconductor
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DOI：
10.1038/nature02838
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发表时间：
2004-09-09
期刊：
影响因子：
64.8
通讯作者：
Itoh, T
中科院分区：
文献类型：
--
作者：
Edamatsu, K;Oohata, G;Itoh, T
量子纠缠是量子信息与通信技术的重要特征之一。最常用于产生高度纠缠的光子对（1，2）的方法是参数下转换。短波长的纠缠光子对于在三个或四个光子之间产生进一步的纠缠是期望的，但是难以使用参数下转换来产生适当能量的纠缠光子对。预计可用于产生这种光子的一种方法是共振超参数散射（RHPS）：通过电子共振三阶非线性光学过程在半导体中产生一对纠缠光子。基于半导体的纠缠光子源对于实际的量子技术也是有利的，但是在半导体中产生纠缠光子的尝试还没有成功（4，5）。在这里，我们报告的实验证据的紫外纠缠光子对的产生通过双激子共振RHPS在半导体CuCl的单晶。我们预计，我们的研究结果将为通过电流注入产生纠缠光子开辟道路，类似于电流驱动的单光子源（6，7）。
Entanglement is one of the key features of quantum information and communications technology. The method that has been used most frequently to generate highly entangled pairs of photons(1,2) is parametric down-conversion. Short-wavelength entangled photons are desirable for generating further entanglement between three or four photons, but it is difficult to use parametric down-conversion to generate suitably energetic entangled photon pairs. One method that is expected to be applicable for the generation of such photons(3) is resonant hyper-parametric scattering (RHPS): a pair of entangled photons is generated in a semiconductor via an electronically resonant third-order non-linear optical process. Semiconductor-based sources of entangled photons would also be advantageous for practical quantum technologies, but attempts to generate entangled photons in semiconductors have not yet been successful(4,5). Here we report experimental evidence for the generation of ultraviolet entangled photon pairs by means of biexciton resonant RHPS in a single crystal of the semiconductor CuCl. We anticipate that our results will open the way to the generation of entangled photons by current injection, analogous to current-driven single photon sources(6,7).