Fachrichtung 7.2 (Experimentalphysik), Universität des Saarlandes, Campus E2.6, 66123 Saarbrücken, Germany.
Phys Rev Lett. 2012 Oct 5;109(14):147404. doi: 10.1103/PhysRevLett.109.147404. Epub 2012 Oct 4.
We demonstrate efficient (>30%) quantum frequency conversion of visible single photons (711 nm) emitted by a quantum dot to a telecom wavelength (1313 nm). Analysis of the first- and second-order coherence before and after wavelength conversion clearly proves that pivotal properties, such as the coherence time and photon antibunching, are fully conserved during the frequency translation process. Our findings underline the great potential of single photon sources on demand in combination with quantum frequency conversion as a promising technique that may pave the way for a number of new applications in quantum technology.
我们展示了一种高效（>30%）的量子频率转换方法，可以将量子点发出的可见单光子（711nm）转换为电信波长（1313nm）。在波长转换前后对一阶和二阶相干性的分析清楚地证明，在频率转换过程中，相干时间和光子反聚束等关键性质得到了完全的保持。我们的发现强调了按需单光子源与量子频率转换相结合的巨大潜力，这是一种很有前途的技术，可能为量子技术的许多新应用铺平道路。
