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Measurements of Quasiparticle Tunneling Dynamics in a Bandgap-Engineered Transmon Qubit
L. Sun, L. DiCarlo, M. D. Reed +9
We have engineered the bandgap profile of transmon qubits by combining oxygen-doped Al for tunnel junction electrodes and clean Al as quasiparticle traps to investigate energy rela…
Relaxation and frequency shifts induced by quasiparticles in superconducting qubits
G. Catelani, R. J. Schoelkopf, M. H. Devoret +1
As low-loss non-linear elements, Josephson junctions are the building blocks of superconducting qubits. The interaction of the qubit degree of freedom with the quasiparticles tunne…
Quasiparticle relaxation of superconducting qubits in the presence of flux
G. Catelani, Jens Koch, L. Frunzio +3
Quasiparticle tunneling across a Josephson junction sets a limit for the lifetime of a superconducting qubit state. We develop a general theory of the corresponding decay rate in a…