3 papers
quant-ph2025
Mapping the positions of Two-Level-Systems on the surface of a superconducting transmon qubit
Jürgen Lisenfeld, Alexander K. Händel, Etienne Daum +3
The coherence of superconducting quantum computers is severely limited by material defects that create parasitic two-level-systems (TLS). Progress is complicated by lacking underst…
quant-ph2025
Gradiometric, Fully Tunable C-Shunted Flux Qubits
Benedikt Berlitz, Alexander Konstantin Händel, Etienne Daum +2
Fully tunable flux qubits offer in-situ and independent controls of their energy potential asymmetry and tunnel barrier, making them versatile tools for quantum computation and the…
cond-mat.supr-con2025
Investigation of Parasitic Two-Level Systems in Merged-Element Transmon Qubits
Etienne Daum, Benedikt Berlitz, Steffen Deck +2
In conventional transmon qubits, decoherence is dominated by a large number of parasitic two-level systems (TLS) residing at the edges of its large area coplanar shunt capacitor an…