Cryogenic microwave link for quantum local area networks

• DOI: 10.48550/arxiv.2308.12398
• Publication Date: 2023-01-01
• Authors: Michael Renger; S. Gandorfer; W. K. Yam; Florian Fesquet; M. Handschuh; Kedar Honasoge; Fabian Kronowetter; Yuki Nojiri; Matti Partanen; Marcel Pfeiffer; Harriet van der V...; A. Matthews; Joonas Govenius; Robab Najafi Jabd...; M. Prunnila; Achim Marx; Frank Deppe; Rudolf Groß; Kirill G. Fedorov
• Keywords: Superconductivity (cond-mat.supr-con); Quantum Physics; Condensed Matter - Superconductivity; FOS: Physical sciences; Physics - Applied Physics; Applied Physics (physics.app-ph); Quantum Physics (quant-ph)

Scalable quantum information processing with superconducting circuits is about to advance from individual processors in single dilution refrigerators more powerful distributed computing systems located separate cooling units order achieve a practical advantage. Hence, realization of hardware platforms for local area networks (QLANs) compatible technology high importance. Here, we demonstrate basic prototype microwave QLAN based on cryogenic link connecting two cryostats over distance 6.6m base temperature 52mK the center. We provide details system design, installation, and performance. employ coaxial transmission lines form communication channel characterize its potential by demonstrating robust entanglement distribution two-mode squeezing between remote parties. By preserving at temperatures up 1K, experimentally verify fluctuation-dissipation theorem. Consequently, that our can backbone future applications.