论文标题
可编程时空量子参数模式或
A Programmable Spatiotemporal Quantum Parametric Mode Sorter
论文作者
论文摘要
我们通过模式选择性量子频率上转换在复合时空希尔伯特空间中实验表明高维信号的可编程参数模式分散器。作为一个具体的例子，考虑到量子通信应用，我们将拉格雷 - 高斯和埃尔米特高斯模式视为信号的空间和时间状态。通过调节上转换泵的时空轮廓，我们证明了这些模式及其叠加模式中单个光子的忠实选择。我们的结果表明，通过将上转换的光耦合到单模光纤和/或在相匹配的边缘操作上转换来改善量子模式分类性能。通过仅优化泵的时间剖面，我们获得了超过12 dB的灭绝，以实现互无偏的基础（MUB）集合的时空模式。这个完全可编程和高效的系统可以作为量子通信，量子计算和量子计量学的可行资源。
We experimentally demonstrate a programmable parametric mode sorter of high-dimensional signals in a composite spatiotemporal Hilbert space through mode-selective quantum frequency up-conversion. As a concrete example and with quantum communication applications in mind, we consider the Laguerre-Gaussian and Hermite-Gaussian modes as the spatial and temporal state basis for the signals, respectively. By modulating the spatiotemporal profiles of the up-conversion pump, we demonstrate the faithful selection of single photons in those modes and their superposition modes. Our results show an improvement in the quantum mode-sorting performance by coupling the up-converted light into a single-mode fiber and/or operating the upconversion at the edge of phase matching. By optimizing pump temporal profiles only, we achieve more than 12 dB extinction for mutually unbiased basis (MUB) sets of the spatiotemporal modes. This fully programmable and efficient system could serve as a viable resource for quantum communications, quantum computation, and quantum metrology.
