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Bulletin of the American Physical Society

Towards long coherence superconducting qubits

Matthias Steffen, Antonio D. Corcoles, Jerry M. Chow, Chad T. Rigetti, M. B. Ketchen, Mary Beth Rothwell, George Keefe, Jim Rozen, Mark Borstelmann, Jack Rohrs, David Peter Divincenzo

Published Mar 23, 2011• 0 citations
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Scalable superconducting qubit architectures demand qubits with long coherence times—a critical prerequisite for developing practical quantum computers. To achieve a compact circuit footprint, we have designed a superconducting qubit featuring a meander-structured coplanar waveguide capacitor, termed the “Smon.” Numerical simulations of the electric field distribution demonstrate that the Smon exhibits a significantly lower energy participation ratio (EPR) than both Xmon qubits and conventional rectangular planar transmon qubits. For an in situ comparison between Smons and conventional rectangular planar transmons, we propose a two-dimensional (2D) hybrid qubit array test structure. The capacitor electrodes of the devices are fabricated using tantalum. Measurements of the Smon’s coherence properties yield an energy relaxation time ( T 1 ) ranging from 30 to 359 µs and a dephasing time ( T 2 ) between 18 and 20 µs. These results confirm that superconducting quantum circuits with enhanced integration density and long coherence times are experimentally feasible, thereby offering a viable pathway toward high-performance large-scale superconducting quantum computers.