Self-guided tomography of time-frequency qudits Serino, Laura Maria Rambach, Markus Brecht, Benjamin Romero, Jacquiline Silberhorn, Christine <jats:title>Abstract</jats:title> <jats:p>High-dimensional time-frequency encodings have the potential to significantly advance quantum information science; however, practical applications require precise knowledge of the encoded quantum states, which becomes increasingly challenging for larger Hilbert spaces. Self-guided tomography (SGT) has emerged as a practical and scalable technique for this purpose in the spatial domain. Here, we apply SGT to estimate time-frequency states using a multi-output quantum pulse gate. We achieve fidelities of more than 99% for 3- and 5-dimensional states without the need for calibration or post-processing. We demonstrate the robustness of SGT against statistical and environmental noise, highlighting its efficacy in the photon-starved regime typical of quantum information applications.</jats:p> IOP Publishing 2025 info:eu-repo/semantics/article doc-type:article text http://purl.org/coar/resource_type/c_6501 https://ris.uni-paderborn.de/record/63215 Serino LM, Rambach M, Brecht B, Romero J, Silberhorn C. Self-guided tomography of time-frequency qudits. <i>Quantum Science and Technology</i>. 2025;10(2). doi:<a href="https://doi.org/10.1088/2058-9565/adb0ea">10.1088/2058-9565/adb0ea</a> eng info:eu-repo/semantics/altIdentifier/doi/10.1088/2058-9565/adb0ea info:eu-repo/semantics/altIdentifier/issn/2058-9565 info:eu-repo/semantics/closedAccess