744 citations · 1.1k across the 5 of their papers we have counts for
5 papers
Probing defect densities at the edges and inside Josephson junctions of superconducting qubits
Alexander Bilmes, Serhii Volosheniuk, Alexey V. Ustinov +1
Tunneling defects in disordered materials form spurious two-level systems which are a major source of decoherence for micro-fabricated quantum devices. For superconducting qubits,…
Interacting two-level defects as sources of fluctuating high-frequency noise in superconducting circuits
Clemens Müller, Jürgen Lisenfeld, Alexander Shnirman +1
Since the very first experiments, superconducting circuits have suffered from strong coupling to environmental noise, destroying quantum coherence and degrading performance. In sta…
Selective darkening of degenerate transitions demonstrated with two superconducting quantum bits
P. C. de Groot, J. Lisenfeld, R. N. Schouten +4
Controlled manipulation of quantum states is central to studying natural and artificial quantum systems. If a quantum system consists of interacting sub-units, the nature of the co…
Observation of the Bloch-Siegert Shift in a Qubit-Oscillator System in the Ultrastrong Coupling Regime
P. Forn-Díaz, J. Lisenfeld, D. Marcos +4
We measure the dispersive energy-level shift of an resonator magnetically coupled to a superconducting qubit, which clearly shows that our system operates in the ultrastrong c…
Multi-photon spectroscopy of a hybrid quantum system
Pavel Bushev, Clemens Müller, Jürgen Lisenfeld +4
We report on experimental multi-photon spectroscopy of a hybrid quantum system consisting of a superconducting phase qubit coherently coupled to an intrinsic two-level defect. We d…