Print Email Facebook Twitter Dynamics of parametric fluctuations induced by quasiparticle tunneling in superconducting flux qubits Title Dynamics of parametric fluctuations induced by quasiparticle tunneling in superconducting flux qubits Author Bal, M. Ansari, M.H. Orgiazzi, J.L. Lutchyn, R.M. Lupascu, A. Faculty Applied Sciences Department QN/Quantum Nanoscience Date 2015-05-22 Abstract We present experiments on the dynamics of a two-state parametric fluctuator in a superconducting flux qubit. In spectroscopic measurements, the fluctuator manifests itself as a doublet line. When the qubit is excited in resonance with one of the two doublet lines, the correlation of readout results exhibits an exponential time decay which provides a measure of the fluctuator transition rate. The rate increases with temperature in the interval 40 to 158 mK. Based on the magnitude of the transition rate and the doublet line splitting, we conclude that the fluctuation is induced by quasiparticle tunneling. These results demonstrate the importance of considering quasiparticles as a source of decoherence in flux qubits. To reference this document use: http://resolver.tudelft.nl/uuid:55d90e7c-0895-4775-b1a0-09b71658cd16 Publisher American Physical Society ISSN 1098-0121 Source https://doi.org/10.1103/PhysRevB.91.195434 Source Physical Review B, 91, 2015 Part of collection Institutional Repository Document type journal article Rights © 2015 American Physical Society Files PDF Ansari_2015.pdf 969.24 KB Close viewer /islandora/object/uuid:55d90e7c-0895-4775-b1a0-09b71658cd16/datastream/OBJ/view