S.I. Raider, J.R. Kirtley, et al.
Japanese Journal of Applied Physics
We have measured the subgap current at 0.8 K in several hysteretic 1.5×1.6 and 2.6×2.6 μ m2 NbAlOxNb tunnel junctions. In zero magnetic field, the critical current Ic ∼8 μA and the subgap resistance R∼0.3 MΩ. When we apply a magnetic field, Ic can be as low as 1 nA, and R is larger than 1 GΩ. This means that in a superconducting qubit made using Nb tunnel junctions, the decoherence rate from the quasiparticle conductance may be as low as 1 (100 μs). © 2004 American Institute of Physics.
S.I. Raider, J.R. Kirtley, et al.
Japanese Journal of Applied Physics
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Europhysics Letters
J.C. Tsang, J.E. Demuth, et al.
Chemical Physics Letters
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Physical Review B - CMMP