9 papers
Substrate insulated Josephson junctions for superconducting quantum circuits
U. Strobel, L. Radtke, L. Kamps +7
We have developed a fabrication technique for Josephson junctions that employs a three-dimensional patterned, low-loss substrate instead of commonly used organic resists. The techn…
Stacked Josephson junctions for quantum circuit applications
Alex Kreuzer, Thilo Krumrey, Hossam Tohamy +3
Low-loss inductors are essential components in various superconducting circuits, such as qubits or digital electronics. In this study, we investigate highly compact inductors forme…
Low-loss Material for Infrared Protection of Cryogenic Quantum Applications
Markus Griedel, Max Kristen, Biliana Gasharova +3
The fragile quantum states of low-temperature quantum applications require protection from infrared radiation caused by higher-temperature stages or other sources. We propose a mat…
Readout failures in superconducting qubits due to TLS-defects in tunnel junctions
J. Lisenfeld, A. K. Händel, A. Bilmes +1
Material defects give rise to parasitic two-level systems (TLS) which present a major source of decoherence in superconducting qubits. Here, we study a strongly coupled TLS that re…
Benchmarking the quality of multiplexed qubit readout beyond assignment fidelity
Andras Di Giovanni, Adrian Skasberg Aasen, Jürgen Lisenfeld +3
The accurate measurement of quantum two-level objects (qubits) is crucial for developing quantum computers. Over the last decade, the measure of choice for benchmarking readout rou…
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…