Regensburg 2004 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 17: Postersitzung II: Transport, Quantenkoh
ärenz, Quantenflüssigkeiten
TT 17.20: Poster
Dienstag, 9. März 2004, 14:30–19:00, Poster A
Superconducting flux qubits — •Heribert Knoglinger, Jürgen Schuler, Chiara Coppi, Matteo Mariantoni, Georg Wild, Christian Probst, Achim Marx, and Rudolf Gross — Walther-Meissner-Institut für Tieftemperaturforschung der Bayerische Akademie der Wissenschaften, 85748 Garching
Superconducting quantum bits (qubits) based on Josephson junctions where the Josephson coupling energy is larger than the charging energy are usually called flux qubits. Starting from our well-established technology used for fabricating single charge transistors based on Al/Al2O3 tunnel junctions we have developed a modified process for fabricating Josephson junctions and superconducting qubit structures. We have used this process to produce and characterize different flux qubit structures.
We discuss different design variants for flux qubits and give a short overview of the process technology. Measurements on various test structures (Josephson junctions, SQUIDs, qubits) are used to analyze and further optimize the system parameters and to compare the different qubit variants. The measurement results and the limits of our technology are the basis for a discussion of the usefulness of the individual elements to realize superconducting qubits.