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This research advances quantum computing by demonstrating a monolithic integration of superconducting circuits with low-loss phonons in AlScN on silicon carbide, addressing critical scalability and connectivity challenges. The platform achieves significant coherence lifetimes for both microwave resonators (2.9 seconds) and acoustic delay lines (7.6 seconds), validating the feasibility of unified structures that coexist without performance degradation.

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Sandia National Laboratories Integrates Superconducting Circuits with AlScN Phonons

Quantum ZeitgeistJuly 19, 20264 min read

Sandia National Laboratories is developing a monolithic platform for coupling superconducting circuits to low-loss microwave phonons in AlScN on 4H-SiC. This work focuses on integrating these circuits, with contributions from researchers at the University of Colorado Boulder, University of Arizona, and University of Pennsylvania.

Researchers from Sandia National Laboratories, the University of Colorado Boulder, University of Arizona, and University of Pennsylvania are pursuing a monolithic platform, aiming to build a single unified structure rather than simply connecting separate components. This approach seeks to overcome limitations in current quantum information processing by leveraging the potential for ultra-compact designs, low losses, and increased connectivity offered by phonons. The work proposes and characterizes a platform combining aluminum superconducting circuits…

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