论文标题
实现多输出量子脉冲门，用于解码单光子状态的高维时间模式
Realization of a multi-output quantum pulse gate for decoding high-dimensional temporal modes of single-photon states
论文作者
论文摘要
光子的时间模式（TMS）为量子信息提供了吸引人的高维编码基础。尽管已经建立了生成TM状态的技术，但单光子TMS的高维解码仍然是一个开放的挑战。在这项工作中，我们在实验上证明了单个光子的五维TMS的消除，平均保真度为0.96 $ \ pm $ 0.01，这是通过测量断层扫描的特征。这是使用新开发的设备，即多输出量子脉冲门（MQPG）实现的。我们根据MQPG的任何基础运行的MQPG证明了原则上完整的解码器。此外，我们通过进行资源有效的状态层析成像，平均保真度为0.98 $ \ pm $ 0.02，确认了MQPG的高质量运行。
Temporal modes (TMs) of photons provide an appealing high-dimensional encoding basis for quantum information. While techniques to generate TM states have been established, high-dimensional decoding of single-photon TMs remains an open challenge. In this work, we experimentally demonstrate demultiplexing of five-dimensional TMs of single photons with an average fidelity of 0.96 $\pm$ 0.01, characterized via measurement tomography. This is achieved using a newly developed device, the multi-output quantum pulse gate (mQPG). We demonstrate a proof-of-principle complete decoder based on the mQPG that operates on any basis from a set of 6 five-dimensional MUBs and is therefore suitable as a receiver for high-dimensional quantum key distribution. Furthermore, we confirm the high-quality operation of the mQPG by performing resource-efficient state tomography with an average fidelity of 0.98 $\pm$ 0.02.
