A Modular Cryogenic Link for Microwave Quantum Communication Over Distances of Tens of Meters

• URL: http://arxiv.org/abs/2604.15971v1
• Date: Fri, 17 Apr 2026 11:35:41 GMT
• Title: A Modular Cryogenic Link for Microwave Quantum Communication Over Distances of Tens of Meters
• Abstract summary: We present a hardware solution for connecting quantum devices operating at microwave frequencies into local area networks.<n> Specifically, we demonstrate a modular system spanning distances of 5, 10 and 30 meters operated at cryogenic temperatures.<n>The assembled 30-meter-long system achieves operating temperatures of below 50 mK after a time of about six and a half days.
• Score: 0.018058404137575482
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum technologies promise a radically new way to solve classically intractable computing problems. Superconducting circuits as a platform are at the forefront of this field. The cryogenic operation temperatures of superconducting circuits however impose challenges for the further scaling to many connected quantum information processing units into a local area or global network. In this work, we present a hardware solution for connecting quantum devices operating at microwave frequencies into local area networks, which enable the exchange of quantum information between spatially separated parties. Specifically, we demonstrate a modular system spanning distances of 5, 10 and 30 meters operated at cryogenic temperatures and connecting two superconducting circuit systems, located in individual dilution refrigerators, through a quantum communication channel. We develop a thermal model to evaluate the heat transfer processes in the setup, optimize the design and select appropriate materials for its construction. The assembled 30-meter-long system achieves operating temperatures of below 50 mK after a cooldown time of about six and a half days. This link enables the execution of distributed quantum computing and communication algorithms. It also adds the resource of non-locality, certified by a loophole-free Bell test, to the field of quantum science and technology with superconducting circuits.

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