Jeffrey S Kline et al 2009 Supercond. Sci. Technol. 22 015004 doi:10.1088/0953-2048/22/1/015004
Jeffrey S Kline1, Haohua Wang2, Seongshik Oh1,3, John M Martinis2 and David P Pappas1
Show affiliationsWe have found that crystalline Josephson junctions have problems with the control of critical current density that decrease the circuit yield. We present a superconducting quantum bit circuit designed to accommodate a factor of five variation in critical current density from one fabrication run to the next. The new design enables the evaluation of advanced tunnel barrier materials for superconducting quantum bits. Using this circuit design, we compare the performance of Josephson phase qubits fabricated with MgO and Al2O3 advanced crystalline tunnel barriers to AlOx amorphous tunnel barrier qubits.
03.67.Lx Quantum computation architectures and implementations
74.50.+r Tunneling phenomena; point contacts, weak links, Josephson effects
Issue 1 (January 2009)
Received 23 September 2008, in final form 24 October 2008
Published 21 November 2008
Jeffrey S Kline et al 2009 Supercond. Sci. Technol. 22 015004
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