Institute for Quantum Information Science (IQIS), Department of Physics and Astronomy, University of Calgary,2500 University Dr. NW, Calgary, Alberta T2N 1N4, Canada.
Opt Lett. 2010 Feb 15;35(4):499-501. doi: 10.1364/OL.35.000499.
We demonstrate a source of photon pairs with widely separated wavelengths, 810 and 1548 nm, generated through spontaneous four-wave mixing in a microstructured fiber. The second-order autocorrelation function g((2))(0) was measured to confirm the nonclassical nature of a heralded single-photon source constructed from the fiber. The microstructured fiber presented herein has the interesting property of generating photon pairs with wavelengths suitable for a quantum repeater able to link free-space channels with fiber channels, as well as for a high-quality telecommunication wavelength heralded single photon source. It also has the advantage of potentially low-loss coupling into standard optical fiber. These reasons make this photon pair source particularly interesting for long-distance quantum communication.
我们展示了一种通过微结构光纤中的自发四波混频产生的具有宽波长分离的光子对源，波长分别为 810nm 和 1548nm。通过测量二阶自相关函数 g((2))(0) ，证实了由光纤构建的被标记单光子源的非经典特性。本文所介绍的微结构光纤具有有趣的性质，它可以产生波长适合量子中继器的光子对，该中继器能够将自由空间通道与光纤通道连接起来，同时也可以作为高质量的电信波长被标记单光子源。它还有可能将其与标准光纤进行低损耗耦合的优势。这些原因使得这种光子对源在长距离量子通信中具有特别的意义。
