Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 17: Superconductivity: Qubits II
TT 17.4: Vortrag
Montag, 12. März 2018, 15:45–16:00, H 2053
Coherent Revival of Ramsey Oscillations in the Fluxonium Qubit Coupled to a bath of Harmonic Oscillators — •Farshad Foroughi1, Mattia Mantovani2, Remy Dassonneville1, Luca Planat1, Javier Puertas1, Sebastien Leger1, Etienne Dumur4, Yuriy Krupko1, Wolfgang Belzig2, Cecile Naud1, Olivier Buisson1, Nicolas Roch1, Frank Hekking1, Gianluca Rastelli2,3, and Wiebke Guichard1 — 1Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, Grenoble, France. — 2Fachbereich Physik, Universität Konstanz, Konstanz, D-78457 , Germany. — 3Zukunftskolleg, Universität Konstanz, D-78457, Konstanz, Germany — 4The institute for Molecular Engineering, University of Chicago, Chicago, IL, United States.
We studied different fluxonium qubits in 2D and 3D cavity-structures and reached the state of the art for coherence and relaxation times. We observed a systematic increase of the relaxation time both in 3D and 2D at the optimal point of the qubit, when quasi-particle tunneling is strongly reduced. We aim to realize a 2D fluxoniums coupled to few on-chip lumped element resonators. We use a fast flux line to control the coupling between the fluxonium qubit and the resonators. We have studied theoretically the emerging spin-boson Hamiltonian for this particular circuit with the perspective of measuring revival effects in the coherent oscillations of the qubit. We started to implement measurements, revealing the effect on the qubit dynamics of a dissipative bath formed by a discrete set of harmonic oscillators.