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Spectroscopic measurements and models of energy deposition in the substrate of quantum circuits by natural ionizing radiation
Joseph W. Fowler, Paul Szypryt, Raymond Bunker +16
Naturally occurring background radiation is a source of correlated decoherence events in superconducting qubits that will challenge error-correction schemes. To characterize the ra…
Optomechanical ground-state cooling in a continuous and efficient electro-optic transducer
Benjamin M. Brubaker, Jonathan M. Kindem, Maxwell D. Urmey +6
The demonstration of a quantum link between microwave and optical frequencies would be an important step towards the realization of a quantum network of superconducting processors.…
Performance of a Kinetic-Inductance Traveling-Wave Parametric Amplifier at 4 Kelvin: Toward an Alternative to Semiconductor Amplifiers
M. Malnou, J. Aumentado, M. R. Vissers +4
Most microwave readout architectures in quantum computing or sensing rely on a semiconductor amplifier at 4 K, typically a high-electron mobility transistor (HEMT). Despite its rem…
A three-wave mixing kinetic inductance traveling-wave amplifier with near-quantum-limited noise performance
M. Malnou, M. R. Vissers, J. D. Wheeler +4
We present a theoretical model and experimental characterization of a microwave kinetic inductance traveling-wave amplifier (KIT), whose noise performance, measured by a shot-noise…
Broadband parametric amplifiers based on nonlinear kinetic inductance artificial transmission lines
Saptarshi Chaudhuri, Dale Li, Kent Irwin +5
We present broadband parametric amplifiers based on the kinetic inductance of superconducting NbTiN thin films in an artificial (lumped-element) transmission line architecture. We…
Concentric transmon qubit featuring fast tunability and an anisotropic magnetic dipole moment
Jochen Braumüller, Martin Sandberg, Michael R. Vissers +10
We present a planar qubit design based on a superconducting circuit that we call concentric transmon. While employing a straightforward fabrication process using Al evaporation and…
Measuring a topological transition in an artificial spin 1/2 system
M. D. Schroer, M. H. Kolodrubetz, W. F. Kindel +6
We present measurements of a topological property, the Chern number (), of a closed manifold in the space of two-level system Hamiltonians, where the two-level system…
Improved superconducting qubit coherence using titanium nitride
J. Chang, M. R. Vissers, A. D. Corcoles +9
We demonstrate enhanced relaxation and dephasing times of transmon qubits, up to ~ 60 μs by fabricating the interdigitated shunting capacitors using titanium nitride (TiN). Compare…