Dilution refrigerator for quantum electronics

• Subject Area: Condensed Matter Physics
• Term: Funded in 2025
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 563611625

The dilution refrigerator for quantum electronics is a low-temperature and magnetic system designed for measuring the physical properties of materials and characterizing quantum devices and circuits at very low temperatures down to approximately 10 mK, and in high magnetic fields that can be applied in different directions, thanks to a vector magnet. A special advantage of the system is the ability to anchor electronic components (e.g., high-frequency filters, low-noise amplifiers) on printed circuit boards at different temperatures, and to investigate solid-state-based circuits across a wide microwave frequency range as well as in the optical range (including fiber optics and free-space optics) under excitation. The system also provides the flexibility of fast sample exchange and enables extensions to established as well as newly developed measurement methods. This way, in many cases, additional independent apparatuses can be avoided, and existing resources can be optimally utilized. The dilution refrigerator is cryogen-free, significantly reducing ongoing operational costs. Furthermore, the measurement system promotes diverse collaborations at both the Technische Universität Braunschweig and with the PTB at the highest instrumental level. The measurement system is necessary for implementing the research concept of the newly established Cryogenic Quantum Electronics group in July 2024, within the Institute of Electrical Measurement Technology and Fundamentals of Electrical Engineering at TU Braunschweig. It is required for several ongoing projects and planned research initiatives. The system complements the existing infrastructure of the Laboratory for Emerging Nanometrology (LENA) and is highly relevant for subsequent projects of the Excellence Cluster EXC-2123 QuantumFrontiers. Additionally, it will support the smooth transfer of the applicant's activities to Braunschweig and, through its expandability, provide a modern instrumental platform for diverse collaborations.

• DFG Programme: Major Research Instrumentation
• Major Instrumentation: Mischungskryostat für Quantenelektronik
• Instrumentation Group: 8550 Spezielle Kryostaten (für tiefste Temperaturen)
• Applicant Institution: Technische Universität Braunschweig
• Leader: Professor Dr. Oleksandr Dobrovolskiy