article published Laura Maria Serino author 88242 Markus Rambach author Benjamin Brecht author 271500000-0003-4140-0556 Jacquiline Romero author Christine Silberhorn author 26263 15 department 623 department <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 Publishing2025 eng 2058-956510.1088/2058-9565/adb0ea 102 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> Serino, Laura Maria, Markus Rambach, Benjamin Brecht, Jacquiline Romero, and Christine Silberhorn. “Self-Guided Tomography of Time-Frequency Qudits.” <i>Quantum Science and Technology</i> 10, no. 2 (2025). <a href="https://doi.org/10.1088/2058-9565/adb0ea">https://doi.org/10.1088/2058-9565/adb0ea</a>. L. M. Serino, M. Rambach, B. Brecht, J. Romero, and C. Silberhorn, “Self-guided tomography of time-frequency qudits,” <i>Quantum Science and Technology</i>, vol. 10, no. 2, Art. no. 025024, 2025, doi: <a href="https://doi.org/10.1088/2058-9565/adb0ea">10.1088/2058-9565/adb0ea</a>. Serino, Laura Maria, et al. “Self-Guided Tomography of Time-Frequency Qudits.” <i>Quantum Science and Technology</i>, vol. 10, no. 2, 025024, IOP Publishing, 2025, doi:<a href="https://doi.org/10.1088/2058-9565/adb0ea">10.1088/2058-9565/adb0ea</a>. @article{Serino_Rambach_Brecht_Romero_Silberhorn_2025, title={Self-guided tomography of time-frequency qudits}, volume={10}, DOI={<a href="https://doi.org/10.1088/2058-9565/adb0ea">10.1088/2058-9565/adb0ea</a>}, number={2025024}, journal={Quantum Science and Technology}, publisher={IOP Publishing}, author={Serino, Laura Maria and Rambach, Markus and Brecht, Benjamin and Romero, Jacquiline and Silberhorn, Christine}, year={2025} } L.M. Serino, M. Rambach, B. Brecht, J. Romero, C. Silberhorn, Quantum Science and Technology 10 (2025). Serino, L. M., Rambach, M., Brecht, B., Romero, J., &#38; Silberhorn, C. (2025). Self-guided tomography of time-frequency qudits. <i>Quantum Science and Technology</i>, <i>10</i>(2), Article 025024. <a href="https://doi.org/10.1088/2058-9565/adb0ea">https://doi.org/10.1088/2058-9565/adb0ea</a> 632152025-12-18T16:07:11Z2025-12-18T16:07:35Z