366 citations · 642 across the 7 of their papers we have counts for
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High coherence hybrid superconducting qubit
Matthias Steffen, Shwetank Kumar, David P. DiVincenzo +4
We measure the coherence of a new superconducting qubit, the {\em low-impedance flux qubit}, finding s. It is a three-junction flux qubit, but the ratio o…
Readout for Phase Qubits without Josephson Junctions
Matthias Steffen, Shwetank Kumar, David DiVincenzo +4
We present a novel readout scheme for phase qubits which eliminates the read-out SQUID so that the entire qubit and measurement circuitry only requires a single Josephson junction.…
Experimental evidence for a surface distribution of two-level systems in superconducting lithographed microwave resonators
Jiansong Gao, Miguel Daal, Peter Day +6
We present measurements of the temperature-dependent frequency shift of five niobium superconducting coplanar waveguide microresonators with center strip widths ranging from 3 m…
Temperature Dependence of the Frequency and Noise of Superconducting Coplanar Waveguide Resonators
Shwetank Kumar, Jiansong Gao, Jonas Zmuidzinas +3
We present measurements of the temperature and power dependence of the resonance frequency and frequency noise of superconducting niobium thin-film coplanar waveguide resonators, c…