Programmable time-frequency mode-sorting of single photons with a multi-output quantum pulse gate
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Posted on 2025-02-04 - 17:01
We demonstrate a high-dimensional mode-sorter for single photons based on a multi-output quantum pulse gate, which we can program to switch between different temporal-mode encodings including pulse modes, frequency bins, time bins, and their superpositions. This device can facilitate practical realizations of quantum information applications such as high-dimensional quantum key distribution, and thus enables secure communication with enhanced information capacity. We characterize the mode-sorter through a detector tomography in 3 and 5 dimensions and find a fidelity up to $0.958\pm 0.030$ at the single-photon level.
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Serino, Laura; Eigner, Christof; Brecht, Benjamin; Silberhorn, Christine (2025). Programmable time-frequency mode-sorting of single photons with a multi-output quantum pulse gate. Optica Publishing Group. Collection. https://doi.org/10.6084/m9.figshare.c.7589996