A versatile source of single photons for quantum information processing
A versatile source of single photons for quantum information processing
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DOI：
10.1038/ncomms2838
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发表时间：
2013-05-01
影响因子：
16.6
通讯作者：
Marquardt, Christoph
中科院分区：
文献类型：
--
作者：
Foertsch, Michael;Fuerst, Josef U.;Marquardt, Christoph
具有可控窄光谱带宽和中心频率的高质量单光子态的产生是促进任何原子系统与非经典光场有效耦合的关键。这种相互作用在量子通信和信息处理以及量子计量学的基础科学和应用的许多实验中是必不可少的。在这里，我们实现了一个完全可调谐的，窄带和高效的单光子源的基础上的回音壁模式谐振器。我们的圆盘形，单片和本征稳定的谐振器是由锂碳酸盐和支持腔辅助自发参量下转换过程。所产生的光子对被发射到两个高度可调谐的谐振器模式中。我们验证波长调谐超过100 nm的两种模式与可控带宽在7.2和13 MHz之间。单光子的预示产生g（（2））（0）< 0.2的反聚束。
The generation of high-quality single-photon states with controllable narrow spectral bandwidths and central frequencies is key to facilitate efficient coupling of any atomic system to non-classical light fields. Such an interaction is essential in numerous experiments for fundamental science and applications in quantum communication and information processing, as well as in quantum metrology. Here we implement a fully tunable, narrow-band and efficient single-photon source based on a whispering gallery mode resonator. Our disk-shaped, monolithic and intrinsically stable resonator is made of lithium niobate and supports a cavity-assisted spontaneous parametric down-conversion process. The generated photon pairs are emitted into two highly tunable resonator modes. We verify wavelength tuning over 100 nm of both modes with controllable bandwidth between 7.2 and 13 MHz. Heralding of single photons yields anti-bunching with g((2))(0) < 0.2.