Wide-band quantum interface for visible-to-telecommunication wavelength conversion
Wide-band quantum interface for visible-to-telecommunication wavelength conversion
复制标题
DOI：
10.1038/ncomms1544
复制
发表时间：
2011-11-01
影响因子：
16.6
通讯作者：
Imoto, Nobuyuki
中科院分区：
文献类型：
--
作者：
Ikuta, Rikizo;Kusaka, Yoshiaki;Imoto, Nobuyuki
虽然长距离量子通信需要通信频段的近红外光子，但在过去的二十年里，人们已经利用可见光光子完成了各种量子信息任务。最近，包括原子量子存储器在内的各种介质中的这种可见光子也得到了研究。因此，在保持量子态的同时，需要从可见光到电信频段的光学频率下转换来弥合这种波长间隙。本文报道了一种利用非线性晶体实现从可见光到电信频段频率下转换的量子接口的演示，这种量子接口有可能在宽频带上工作，从而产生一个高速的频率转换接口。我们实现了从780 nm处的皮秒可见光子到1,522 nm处的光子的转换，并观察到转换过程中下转换的光子与另一个光子之间保持了纠缠。
Although near-infrared photons in telecommunication bands are required for long-distance quantum communication, various quantum information tasks have been performed by using visible photons for the past two decades. Recently, such visible photons from diverse media including atomic quantum memories have also been studied. Optical frequency down-conversion from visible to telecommunication bands while keeping the quantum states is thus required for bridging such wavelength gaps. Here we report demonstration of a quantum interface of frequency down-conversion from visible to telecommunication bands by using a nonlinear crystal, which has a potential to work over wide bandwidths, leading to a highspeed interface of frequency conversion. We achieved the conversion of a picosecond visible photon at 780 nm to a 1,522-nm photon, and observed that the conversion process retained entanglement between the down-converted photon and another photon.