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《Science Bulletin》 2019年21期
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Storage of telecom-C-band heralded single photons with orbital-angular-momentum encoding in a crystal

Yi-Lin Hua  Tian-Shu Yang  Zong-Quan Zhou  Jian Wang  Xiao Liu  Zong-Feng Li  Pei-Yun Li  Yu Ma  Chao Liu  Peng-Jun Liang  Jun Hu  Xue Li  Chuan-Feng Li  Guang-Can Guo  
【摘要】:A memory-based quantum repeater architecture provides a solution to distribute quantum information to an arbitrary long distance.Practical quantum repeaters are likely to be built in optical-fiber networks which take advantage of the low-loss transmission between quantum memory nodes.Most quantum memory platforms have characteristic atomic transitions away from the telecommunication band.A nondegenerate photon pair source is therefore useful for connection of a quantum memory to optical fibers.Here,we report a high-brightness narrowband photon-pair source which is compatible with a rare-earth-ion-doped crystal Pr~(3+):Y_2SiO_5.The photon-pair source is generated through a cavityenhanced spontaneous parametric down-conversion process with the signal photon at 606 nm and the idler photon at 1540 nm.Moreover,using the telecom C-band idler photons for heralding,we demonstrate the reversible transfer of orbital-angular-momentum qubit between the signal photon and the quantum memory based on Pr~(3+):Y_2SiO_5.

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