Highly efficient frequency conversion with bandwidth compression of quantum light.
Highly efficient frequency conversion with bandwidth compression of quantum light.
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DOI：
10.1038/ncomms14288
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发表时间：
2017-01-30
影响因子：
16.6
通讯作者：
Silberhorn C
中科院分区：
文献类型：
--
作者：
Allgaier M;Ansari V;Sansoni L;Eigner C;Quiring V;Ricken R;Harder G;Brecht B;Silberhorn C
混合量子网络依赖于不同量子节点的有效接口，因为基于参数下转换源、量子点、色心或原子的元素在频率和带宽上是根本不同的。虽然脉冲操作已经在非常不同的系统中得到了证明，但迄今为止，还没有一种接口可以同时提供有效的带宽压缩和大量的频率转换。在这里，我们展示了在铌酸锂中实现这两个目标的工程和频率转换过程。我们将电信波长的纯光子转换为可见范围，同时在保留非经典光子数统计的情况下将带宽压缩7.47倍。我们实现了61.5%的内部转换效率，显著优于带宽压缩的频谱滤波。因此，我们的系统在以前不兼容的量子系统之间建立了连接，作为迈向可用量子网络的一步。在量子信息技术中，一个元素的输出通常与下一个元素输入所需的频率和带宽不匹配。在这里，Allgaier等人展示了单光子在不改变其量子统计量的情况下同时进行频率和带宽转换。
Hybrid quantum networks rely on efficient interfacing of dissimilar quantum nodes, as elements based on parametric downconversion sources, quantum dots, colour centres or atoms are fundamentally different in their frequencies and bandwidths. Although pulse manipulation has been demonstrated in very different systems, to date no interface exists that provides both an efficient bandwidth compression and a substantial frequency translation at the same time. Here we demonstrate an engineered sum-frequency-conversion process in lithium niobate that achieves both goals. We convert pure photons at telecom wavelengths to the visible range while compressing the bandwidth by a factor of 7.47 under preservation of non-classical photon-number statistics. We achieve internal conversion efficiencies of 61.5%, significantly outperforming spectral filtering for bandwidth compression. Our system thus makes the connection between previously incompatible quantum systems as a step towards usable quantum networks. In quantum information technology the output of one element often does not match the required frequency and bandwidth of the input of the next element. Here, Allgaier et al. demonstrate simultaneous frequency and bandwidth conversion of single photons without changing their quantum statistics.