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Bulletin of the American Physical Society

Magnetic cooling of electrons to 311 μK in a cryo-free dilution refrigerator

Mohammad Samani, C. P. Scheller, Nikolai Yurttagül, Kestutis Grigoras, Omid Sharifi Sedeh, Alexander Thomas Jones, R. P. Haley, Jonathan R. Prance, Mika Prunnila, Dominik M. Zumbühl

Published Mar 18, 2021• 0 citations
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We make use of a custom-designed cryo-CMOS multiplexer to enable multiple quantum devices to be characterized in a single cooldown of a dilution refrigerator. Combined with a packaging approach that integrates cryo-CMOS chips and a hot-swappable parallel-device test platform, we describe how this setup takes the standard wiring configuration of a dilution refrigerator as input and expands the capability for batch characterization of quantum devices at milli-Kelvin temperatures and high magnetic fields. The architecture of the cryo-CMOS multiplexer is discussed, and its performance is benchmarked using few-electron quantum dots and Hall mobility mapping measurements.
Given the limited space and cooling capacity in dilution refrigerators, it is challenging to scale the number of qubits for a fault-tolerant quantum computer (QC). In this paper, we study a custom-scaled CMOS technology to overcome the constraints in the dilution refrigerators. With Cryo-Design/ Technology CoOptimization (Cryo-DTCO) in an advanced node, one can then reduce the control power from 26.8 mW/ qubit to 8.4 mW/ qubit (∼0.31×)(\sim 0.31 \times)(∼0.31×). Projections suggest this may be sufficient to enable error corrections via surface codes for fault-tolerant computing.