Scalability of Superconductor Electronics: Limitations Imposed by AC Clock and Flux Bias Transformers

نویسندگان

چکیده

Flux transformers are the necessary component of all superconductor digital integrated circuits utilizing ac power for logic cell excitation and clocking, flux biasing, e.g., Adiabatic Quantum Parametron (AQFP), Reciprocal Logic, superconducting sensor arrays, qubits, etc. We consider limitations to integration scale (device number density) imposed by critical current transmission lines cross coupling between adjacent transformers. The former sets minimum line width mutual length in transformer, whereas latter spacing Decreasing linewidth (Nb) wires increases kinetic inductance transformer's secondary, decreasing its primary. This limits size As a result, there is ~100 nm which determines maximum achievable integration. Using AQFP as an example, we calculate dependence density on various types inductors available SFQ5ee fabrication process developed at MIT Lincoln Laboratory, estimate circuit few million AQFPs per cm^2. propose advanced 10x increase other ac-powered circuits. In this process, formed from patterned bilayer geometrical material deposited over layer high (e.g., NbN). Individual pattering layers allows create stripline wide range inductances, low values typical Nb striplines NbN thin films, preserve sufficient with extremely crosstalk.

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ژورنال

عنوان ژورنال: IEEE Transactions on Applied Superconductivity

سال: 2023

ISSN: ['1558-2515', '1051-8223']

DOI: https://doi.org/10.1109/tasc.2022.3230373