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Researchers at the Karlsruhe Institute of Technology have demonstrated a novel architecture using vertically stacked Josephson junctions to create compact inductors for superconducting quantum circuits. By eliminating dielectric materials in the connecting bridges, this design effectively reduces parasitic capacitance and energy loss, addressing key scaling limitations in quantum processor fabrication. This approach offers a viable pathway toward denser, more efficient quantum technologies, though further optimization of the fabrication process remains necessary.
Vertically Stacked Junctions Boost Superconducting Device Design
This study investigates compact inductors created by vertically stacking Josephson junctions, utilizing multiple layers of aluminum separated by tunnel barriers. These stacked junctions are connected with superconducting bridges designed to minimize energy loss, and the research details implementation, fabrication, and characterization of these devices.
Researchers at the Karlsruhe Institute of Technology detailed superconducting devices with a novel architecture that increases density by employing several layers of aluminum separated by tunnel barriers. This departure from traditional single-layer designs utilizes vertically stacked Josephson junctions to create more compact inductors for quantum circuits. Individual stacks are then connected by suspended superconducting bridges, intentionally designed free of…
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