Physics Colloquium - October 14th 2026
Dear Faculty and Students: Our department is excited to host the upcoming Colloquium on Wednesday, October 14th. Refreshments will be served! Speaker: Joonwoo Bae, Associate Professor Title: Practical and efficient verification of Entanglement with Incomplete Measurement Settings Time: 1:30 pm – 3 pm Location: HN1311
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Host: Prof. Janos Bergou Abstract: We present a practical and efficient framework for verifying entangled states when only a tomographically incomplete measurement setting is available—specifically, when access to observables is severely limited. We show how the experimental estimation of a small number of observables can be directly exploited to construct a large family of entanglement witnesses, enabling the efficient identification of entangled states. Moreover, we introduce an optimization approach, formulated as a semidefinite program, that systematically searches for those witnesses best suited to reveal entanglement under the given measurement constraints. We demonstrate the practicality of the approach in a proof-of-principle experiment with photon-polarization qubits, where entanglement is certified using only a fraction of the full measurement data. These results reveal the maximal usefulness of incomplete measurement settings for entanglement verification in realistic scenarios. About the Speaker: Joonwoo Bae is an Associate Professor in the School of Electrical Engineering at KAIST (Korea Advanced Institute for Science and Technology). His research focuses on quantum information theory and its applications, including quantum algorithms, quantum communication and network protocols, quantum cryptography, quantum certification, and quantum error mitigation. He received his Ph.D. in theoretical physics from the University of Barcelona in 2007, conducting his research in quantum information theory at ICFO – the Institute of Photonic Sciences. Before joining KAIST, he held research positions at the Korea Institute for Advanced Study, the Centre for Quantum Technologies at the National University of Singapore, and the Freiburg Institute for Advanced Studies. His work spans both the foundations and practical applications of quantum information processing, with particular contributions to quantum state discrimination, entanglement, and quantum communication. We look forward to your participation!