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TUE: Tuesday Contributed Sessions
TUE 2: Quantum Networks: Technologies
TUE 2.7: Talk
Tuesday, September 9, 2025, 15:45–16:00, ZHG002
Integrated quantum network nodes — •Jonas C. J. Zatsch1,2, Tim Engling1,2, Jeldrik Huster1,2, Louis L. Hohmann1,2, Shreya Kumar1,2, and Stefanie Barz1,2 — 1Institute for Functional Matter and Quantum Technologies, University of Stuttgart, 70569 Stuttgart, Germany — 2Center for Integrated Quantum Science and Technology (IQST)
Quantum networks require both local quantum information processing and the transmission of quantum information across the network. Integrated photonic circuits are promising candidates for quantum nodes, as they offer a compact footprint and scalability, while optical fibres allow for low-loss transmission between such nodes. A key challenge is the transfer of quantum states generated or manipulated on-chip to the network; and vice versa. Here, we present a silicon-on-insulator integrated photonic circuit capable of high-fidelity preparation of two-qubit states, which can be transferred to optical networks. In turn, quantum states sent over an optical network can be analysed using the same chip. We demonstrate its functionality by preparing different two-qubit states on-chip and transferring them to fibres. Additionally, we show its reverse operation by using the chip as a two-qubit quantum state tomography unit for an off-chip prepared state. This bidirectional operation makes our chip a versatile platform for the implementation of quantum networked protocols.
Keywords: Integrated Photonics; Quantum Optics; Quantum Technologies; Quantum Networks; Quantum Communication