SAMOP 2023 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 43: QI Poster II (joint session QI/Q)

Q 43.43: Poster

Wednesday, March 8, 2023, 16:30–19:00, Empore Lichthof

Multi-Output Quantum Pulse Gate: a High-Dimensional Temporal-Mode Decoder — •Laura Serino, Jano Gil-Lopez, Michael Stefszky, Raimund Ricken, Christof Eigner, Benjamin Brecht, and Christine Silberhorn — Paderborn University, Integrated Quantum Optics, Institute for Photonic Quantum Systems (PhoQS), Warburger Str. 100, 33098 Paderborn, Germany

Future quantum technologies will require the implementation of complex quantum communication (QC) networks. Temporal modes (TMs) provide an appealing high-dimensional encoding alphabet based on the time-frequency degree of freedom of photons, leading to important advantages for QC applications. A TM-based QC scheme requires the simultaneous detection of multiple TMs of single photons, which has not yet been achieved.

In this work, we demonstrate high-dimensional single-photon TM decoding with a multi-output quantum pulse gate (mQPG). The mQPG is a device that provides simultaneous projection of multiple TMs onto all the elements of a chosen alphabet (or their superpositions) and maps each result onto a different output frequency. We demonstrate that the mQPG is compatible with single-photon-level input states from a full set of five-dimensional mutually unbiased bases, and we characterize its performance through a detector tomography. We then proceed to demonstrate a proof-of-principle decoder for high-dimensional quantum key distribution based on the mQPG.