YBCO-on-Kapton: Material for High-Density Quan-tum Computer Interconnects with Ultra-Low Thermal Conductance

Journal Article · Wed Feb 03 04:00:00 EST 2021 · IEEE Transactions on Applied Superconductivity

DOI:https://doi.org/10.1109/tasc.2021.3057010· OSTI ID:1764583

Solovyov, Vyacheslav ^[1]; Mendleson, Zachary ^[1]; Saira, Olli Pentti ^[2]; Drozdov, Ilya ^[2]

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1. Brookhaven Technology Group, Inc., Stony Brook, NY (United States)
2. Brookhaven National Lab. (BNL), Upton, NY (United States)

Development of practical quantum computers would require 1000's of qubits and equally large number of read-outs, bias and drive lines. New materials that combine low passive loss and good RF properties are needed. In this study we report performance of signal interconnects comprised of high-temperature YBCO films that are exfoliated from a metal substrate and transferred to a E-Kapton tape. The technology offers low-loss transition be-tween 60 K to sub-mK environments and interfacing with off-shelf flexible silicon electronics. We demonstrate < 1 dB/m at-tenuation at 6 GHz at 77 K. The microstrip assemblies demon-strated no degradation upon multiple cycles to liquid Nitrogen and conduction cooling down to 18 K. We discuss designs of a practical high-density signal cable with passive heat load well below 1 μW per line. The YBCO-on-Kapton technology offers a practical pathway to large error-corrected quantum computing systems.

• Research Organization: Brookhaven National Laboratory (BNL), Upton, NY (United States)
• Sponsoring Organization: USDOE Office of Science (SC); USDOE Laboratory Directed Research and Development (LDRD) Program
• Grant/Contract Number: SC0012704
• OSTI ID: 1764583
• Report Number(s): BNL--220992-2021-JAAM
• Journal Information: IEEE Transactions on Applied Superconductivity, Journal Name: IEEE Transactions on Applied Superconductivity Journal Issue: 5 Vol. 31; ISSN 1051-8223
• Publisher: Institute of Electrical and Electronics Engineers (IEEE)
• Country of Publication: United States
• Language: English

Related Subjects

47 OTHER INSTRUMENTATION
RF properties
high temperature superconductors
quantum computing
thermal conductivity