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SYAD: Symposium SAMOP Dissertation Prize 2026

SYAD 1: SAMOP Dissertation Prize Symposium

SYAD 1.4: Hauptvortrag

Montag, 2. März 2026, 16:00–16:30, RW 1

Harnessing time-frequency qudits using integrated nonlinear processes — •Laura Serino — Paderborn University, Integrated Quantum Optics, Institute for Photonic Quantum Systems (PhoQS), Paderborn, Germany — Quantum Technology Laboratory, University of Queensland, Brisbane, Australia

High-dimensional quantum systems, or qudits, offer significant advantages over qubits, from increased information capacity to enhanced noise resilience and security in quantum communication. While the time-frequency degree of freedom of photons offers large, fiber-compatible quantum states that are ideal for these systems, practical progress has been limited by the lack of an experimental framework that can flexibly generate, manipulate, and measure these states.

In this talk, we present a scalable and reconfigurable experimental framework for qudit processing in the time-frequency domain. At its core is the multi-output quantum pulse gate (mQPG), a programmable decoder based on dispersion-engineered sum-frequency generation in an integrated nonlinear waveguide. The mQPG can be programmed in real time to perform parallel projective measurements of a quantum state onto a complete, arbitrary basis of temporal modes. Using this capability, we experimentally realize high-dimensional quantum key distribution, achieve precise quantum state characterization, and test quantum complementarity in large Hilbert spaces. These results establish the mQPG as a versatile tool for applications ranging from practical quantum technologies to fundamental science, harnessing the full potential of time-frequency qudits.

Keywords: qudits; quantum communication; integrated quantum optics