Millikelvin temperature cryo-CMOS multiplexer for scalable quantum device characterisation

Abstract

Quantum computers based on solid state qubits have been a subject of rapid development in recent years. In current Noisy Intermediate-Scale Quantum (NISQ) technology, each quantum device is controlled and characterised though a dedicated signal line between room temperature and base temperature of a dilution refrigerator. This approach is not scalable and is currently limiting the development of large-scale quantum system integration and quantum device characterisation. Here we demonstrate a custom designed cryo-CMOS multiplexer operating at 32 mK. The multiplexer exhibits excellent microwave properties up to 10 GHz at room and millikelvin temperatures. We have increased the characterisation throughput with the multiplexer by measuring four high-quality factor superconducting resonators using a single input and output line in a dilution refrigerator. Our work lays the foundation for large-scale microwave quantum device characterisation and has the perspective to address the wiring problem of future large-scale quantum computers.

arXiv comment22+11 pages, 3+5 figures, 1+1 tables

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• Interconnect Fabrics for Multi-Core Quantum Processors: A Context Analysis
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• Integrated multiplexed microwave readout of silicon quantum dots in a cryogenic CMOS chip
• Cryogenic Thermal Modeling of Microwave High Density Signaling
• Hardware-level Interfaces for Hybrid Quantum-Classical Computing Systems
• Epitaxial titanium nitride microwave resonators: Structural, chemical, electrical, and microwave properties