Thompson James K, Simon Jonathan, Loh Huanqian, Vuletic Vladan
Department of Physics, MIT-Harvard Center for Ultracold Atoms, Research Laboratory of Electronics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA.
Science. 2006 Jul 7;313(5783):74-7. doi: 10.1126/science.1127676.
We generated narrowband pairs of nearly identical photons at a rate of 5 x 10(4) pairs per second from a laser-cooled atomic ensemble inside an optical cavity. A two-photon interference experiment demonstrated that the photons could be made 90% indistinguishable, a key requirement for quantum information-processing protocols. Used as a conditional single-photon source, the system operated near the fundamental limits on recovery efficiency (57%), Fourier transform-limited bandwidth, and pair-generation-rate-limited suppression of two-photon events (factor of 33 below the Poisson limit). Each photon had a spectral width of 1.1 megahertz, ideal for interacting with atomic ensembles that form the basis of proposed quantum memories and logic.
我们在光学腔内的激光冷却原子系综中，以每秒5×10⁴对的速率产生了近乎相同光子的窄带对。双光子干涉实验表明，这些光子的不可区分度可达90%，这是量子信息处理协议的一项关键要求。该系统用作条件单光子源时，其运行接近恢复效率（57%）、傅里叶变换极限带宽以及双光子事件的对产生率限制抑制（比泊松极限低33倍）的基本极限。每个光子的光谱宽度为1.1兆赫兹，非常适合与构成所提议量子存储器和逻辑基础的原子系综相互作用。
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