Berlin 2024 – wissenschaftliches Programm
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QI: Fachverband Quanteninformation
QI 24: Verification and Benchmarking of Quantum Systems
QI 24.4: Vortrag
Donnerstag, 21. März 2024, 10:30–10:45, HFT-TA 441
Certifying the topology of quantum networks: theory and experiment — •Lisa T. Weinbrenner1, Nidhin Prasannan2, Kiara Hansenne1, Sophia Denker1, Jan Sperling3, Benjamin Brecht2, Christine Silberhorn2, and Otfried Gühne1 — 1Naturwissenschaftlich-Technische Fakultät, Universität Siegen, Germany — 2Paderborn University, Integrated Quantum Optics, Institute of Photonic Quantum Systems (PhoQS), Germany — 3Paderborn University, Theoretical Quantum Science, Institute for Photonic Quantum Systems (PhoQS), Germany
Distributed quantum information in networks is paramount for global secure quantum communication. Moreover, it finds applications as a resource for relevant tasks, such as clock synchronization, magnetic field sensing, and blind quantum computation. For quantum network analysis and benchmarking of implementations, however, it is crucial to characterize the topology of networks in a way that reveals the nodes between which entanglement can reliably be distributed. Here, we demonstrate an efficient scheme for this topology certification. Our scheme allows for distinguishing, in a scalable manner, different networks consisting of bipartite and multipartite entanglement sources, for different levels of trust in the measurement devices and network nodes. We experimentally demonstrate our approach by certifying the topology of different six-qubit networks generated with polarized photons, employing active feed-forward and time multiplexing. Our methods can be used for general simultaneous tests of multiple hypotheses with few measurements, being useful for other certification scenarios.
Keywords: Topology certification; Hypothesis testing; Active feed-forward; Polarized photons; Fidelity estimation