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Programmable time-frequency mode-sorting of single photons with a multi-output quantum pulse gate

Version 2 2025-02-04, 17:01
Version 1 2025-02-04, 17:00
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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AUTHORS (4)

Laura Serino
Christof Eigner
Benjamin Brecht
Christine Silberhorn

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