43 citations · 309 across the 20 of their papers we have counts for
19 papers
Mapping the positions of Two-Level-Systems on the surface of a superconducting transmon qubit
Jürgen Lisenfeld, Alexander K. Händel, Etienne Daum +3
The coherence of superconducting quantum computers is severely limited by material defects that create parasitic two-level-systems (TLS). Progress is complicated by lacking underst…
Amplitude and frequency sensing of microwave fields with a superconducting transmon qudit
Maximilian Kristen, Andre Schneider, Alexander Stehli +9
Experiments with superconducting circuits require careful calibration of the applied pulses and fields over a large frequency range. This remains an ongoing challenge as commercial…
Design and experimental study of superconducting left-handed transmission lines with tunable dispersion and improved impedance match
E. A. Ovchinnikova, V. P. Koshelets, L. V. Filippenko +3
We continue detailed study of microwave properties of a superconducting left-handed tunable CPW transmission line (LHTL). The line consists of a central conductor, loaded with seri…
Nonreciprocal transmission of microwaves through a long Josephson junction
A. L. Pankratov, K. G. Fedorov, M. Salerno +2
Nonreciprocal microwave transmission through a long Josephson junction in the flux-flow regime is studied analytically and numerically within the framework of the perturbed sine-Go…
Superconducting hot-electron nanobolometer with microwave bias and readout
A. A. Kuzmin, M. Merker, S. V. Shitov +7
We propose a new detection technique based on radio-frequency (RF) bias and readout of an antenna-coupled superconducting nanobolometer. This approach is suitable for Frequency-Div…
Electrodynamics of a planar Archimedean spiral resonator
N. Maleeva, N. N. Abramov, A. S. Averkin +4
We present a theoretical and experimental study of electrodynamics of a planar spiral superconducting resonator of a finite length. The resonator is made in the form of a monofilar…
Broadband Sample Holder for Microwave Spectroscopy of Superconducting Qubits
A. S. Averkin, A. Karpov, K. Shulga +5
We present a practical design and implementation of a broadband sample holder suitable for microwave experiments with superconducting integrated circuits at millikelvin temperature…
Probing the TLS Density of States in SiO Films using Superconducting Lumped Element Resonators
S. T. Skacel, Ch. Kaiser, S. Wuensch +6
We have investigated dielectric losses in amorphous SiO thin films under operating conditions of superconducting qubits (mK temperatures and low microwave powers). For this purpose…
Flux Dependent Crossover Between Quantum and Classical Behavior in a dc-SQUID
Susanne Butz, Alexey K. Feofanov, Kirill G. Fedorov +7
In a coupled system of one classical and one quantum mechanical degree of freedom, the quantum degree of freedom can facilitate the escape of the whole system. Such unusual escape…
Ultra-compact tunable split-ring resonators
A. Vidiborskiy, V. P. Koshelets, L. V. Filippenko +2
We propose tunable superconducting split-ring resonators (SRRs) employing nonlinear Josephson inductance. A fraction of SRR is replaced by Nb-AlOx-Nb Josephson tunnel junctions con…
Electrodynamics of a ring-shaped spiral resonator
N. Maleeva, M. V. Fistul, A. Karpov +4
We present analytical, numerical and experimental investigations of electromagnetic resonant modes of a compact monofilar Archimedean spiral resonator shaped in a ring, with no cen…
Spectroscopy of a Qubit Array via a Single Transmission Line
M. Jerger, S. Poletto, P. Macha +4
Frequency-selective readout for superconducting qubits opens the way towards scaling qubit circuits up without increasing the number of measurement lines. Here we demonstrate the r…
Effect of LaAlO3 twin-domain topology on local dc and microwave properties of cuprate films
A. P. Zhuravel, Steven M. Anlage, Stephen K. Remillard +2
Different imaging modes of low temperature laser scanning microscopy (LTLSM) have been applied to probe local optical and superconducting properties, as well as the spatial variati…
Superconducting RF Metamaterials Made with Magnetically Active Planar Spirals
C. Kurter, A. P. Zhuravel, J. Abrahams +3
Superconducting metamaterials combine the advantages of low-loss, large inductance (with the addition of kinetic inductance), and extreme tunability compared to their normal metal…
A tunable rf SQUID manipulated as flux and phase qubit
S Poletto, F Chiarello, M G Castellano +4
We report on two different manipulation procedures of a tunable rf SQUID. First, we operate this system as a flux qubit, where the coherent evolution between the two flux states is…
Vortex qubit based on an annular Josephson junction containing a microshort
A. N. Price, A. Kemp, D. R. Gulevich +2
We report theoretical and experimental work on the development of a vortex qubit based on a microshort in an annular Josephson junction. The microshort creates a potential barrier…
Microwave Current Imaging in Passive HTS Components by Low-Temperature Laser Scanning Microscopy (LTLSM)
A. P. Zhuravel, Steven M. Anlage, A. V. Ustinov
We have used the LTLSM technique for a spatially resolved investigation of the microwave transport properties, nonlinearities and material inhomogeneities in an operating coplanar…
Imaging Local Sources of Intermodulation in Superconducting Microwave Devices
A. P. Zhuravel, A. V. Ustinov, D. Abraimov +1
This work presents new experimental results on low-temperature (LT) characterization of local rf properties of passive superconducting (SC) microwave devices using a novel Laser Sc…
Effect of LaAlO Surface Topography on RF Current Distribution in Superconducting Microwave Devices
A. P. Zhuravel, A. V. Ustinov, H. Harshavardhan +1
A laser scanning microscope with a thermal spot size of about 4 m is used to measure a quantity proportional to the rf current density in an operating superconducting co-planar…