Scholz Matthias, Koch Lars, Benson Oliver
Nano-Optics Group, Physics Department, Humboldt University, D-10117 Berlin, Germany.
Phys Rev Lett. 2009 Feb 13;102(6):063603. doi: 10.1103/PhysRevLett.102.063603.
Narrow-band single photons represent an important resource for quantum memories due to their efficient interaction with atomic resonances. In this Letter, we report on the generation of photons with 3 MHz linewidth by cavity-enhanced parametric down-conversion and demonstrate direct proof of their single-photon character by detection of heralding idler photons. Compared to a Poissonian source, a suppression of higher-order photon numbers by nearly 2 orders of magnitude could be achieved. Moreover, the brightness of our source exceeds previous realizations by more than a factor of 100.
窄带单光子由于其与原子共振的高效相互作用，是量子存储器的重要资源。在本信函中，我们报告了通过腔增强参量下转换产生线宽为3兆赫兹的光子，并通过探测伴生闲频光子直接证明了它们的单光子特性。与泊松光源相比，高阶光子数可被抑制近2个数量级。此外，我们光源的亮度比以往的实现方式高出100多倍。
