Dresden 2026 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 92: Transport – Poster

TT 92.6: Poster

Donnerstag, 12. März 2026, 18:00–20:00, P4

Double galvanic access to a microwave cavity for flux-mediated optomechanics with carbon nanotubes SQUIDs — •Julian Sehr, Tim Althuon, Philipp Wiedemann, Sophie Klingel, Philipp Bennett, Tino Cubaynes, and Wolfgang Wernsdorfer — Karlsruher Institut für Technologie (KIT), 76131 Karlsruhe

Carbon nanotubes (CNTs) are attractive as Josephson junction weak links, offering ballistic, one-dimensional transport and the ability to electrostatically tune their carrier density and transmission. By employing two parallel Josephson junctions formed from a single carbon nanotube mechanically transferred onto the circuit after growth, we realised a superconducting quantum interference device (DC-SQUID). The device supports an induced supercurrent of up to 4 nA through a single CNT-based junction. We expect to increase the critical current by changing the superconductor of the electronic circuits from molybdenum-rhenium to niobium. Embedding such a SQUID into a non-linear microwave cavity opens up the possibility to couple the phonon modes of the CNT to cavity photons via flux-mediated optomechanical coupling. This will be realised by making the cavity galvanically accessible from both sides, while the boundaries of the resonator are defined by a filtering stage using an on-chip planar capacitance.

Keywords: Quantum Dots; Quantum Wires; Microwave cavities; Carbon nanotube gatemon