2006/02/17 by Matthias Steffen, M. Ansmann, R. McDermott +7 · 2 citations
Physics and Astronomy · #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.97.050502
submitted to PRL
arxiv created 2006/02/17 · arxiv updated 2009/12/01
We introduce a new design concept for superconducting quantum bits (qubits) in which we explicitly separate the capacitive element from the Josephson tunnel junction for improved qubit performance. The number of two-level systems (TLS) that couple to the qubit is thereby reduced by an order of magnitude and the measurement fidelity improves to 90%. This improved design enables the first demonstration of quantum state tomography with superconducting qubits using single shot measurements.