Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 6: Superconductivity: Tunnelling and Josephson Junctions I
TT 6.1: Vortrag
Montag, 18. März 2024, 09:30–09:45, H 3010
Tailoring arbitrary energy-phase relationships using Josephson tunnel junctions — •A. Mert Bozkurt1,2, Jasper Brookman1, Valla Fatemi3, and Anton Akhmerov1 — 1Kavli Institute of Nanoscience, Delft University of Technology, P.O. Box 4056, 2600 GA Delft, The Netherlands — 2QuTech, Delft University of Technology, 2600 GA Delft, The Netherlands — 3School of Applied and Engineering Physics, Cornell University, Ithaca, NY 14853 USA
Josephson tunnel junctions exhibit a simple current-phase relation, characterized by single harmonics. Conversely, high-transparency Josephson junctions feature multiple harmonics, with the specific harmonics depend on microscopic details of the junction, presenting a challenge for precise control. We find that when two Josephson tunnel junctions are connected in series, their energy-phase relationship is identical to a high-transparency Josephson junction. By connecting multiple arms in parallel and introducing a magnetic flux, we can systematically engineer specific current-phase relationships. As an example, we present a superconducting diode implementation with a high efficiency, a two-terminal device that controls supercurrent flow in one direction differently from the other. The resulting superconducting diode efficiency is robust against the imperfections in the design parameters, making it practical for real-world implementations. Beyond superconducting diodes, we showcase various other energy-phase relationships to demonstrate the versatility of the approach. This technique can be useful for engineering sophisticated energy-phase landscapes for advanced quantum computing systems.
Keywords: Superconducting diode; Josephson junction array; Fourier engineering; Energy-phase relationship; Superconducting tunnel junction