368 citations · 1k across the 28 of their papers we have counts for
28 papers
Fast optical data transfer into a Josephson junction array
K. Kohopää, J. Nissilä, E. Mykkänen +19
We employ externally shunted Nb-AlO-Nb Josephson junctions for demonstrating a circuit that is suitable for an optically driven Josephson Arbitrary Waveform Synthesizer (JAWS).…
In-situ electro-optic sampling of microwave signals under cryogenic conditions and for superconducting applications
Shekhar Priyadarshi, Rinis Ferizaj, Oliver Kieler +8
We demonstrate a cryogenic electro-optic sampling (EOS) setup that allows for the measurement of microwave signals at arbitrary positions on a cryogenic chip-scale device. We use a…
Efficient electronic cooling above 2 K by niobium-based superconducting tunnel junctions
J. Hätinen, A. Ronzani, R. P. Loreto +15
Replacing the bulky cryoliquid-based cooling stages of cryoenabled instruments by chip-scale refrigeration is envisioned to disruptively reduce the system size similar to microproc…
Effect of ion irradiation on superconducting thin films
Katja Kohopää, Alberto Ronzani, Robab Najafi Jabdaraghi +8
We demonstrate ion irradiation by argon or gallium as a wafer-scale post-processing method to increase disorder in superconducting thin films. We study several widely used supercon…
Thermal resistance in superconducting flip-chip assemblies
Joel Hätinen, Emma Mykkänen, Klaara Viisanen +5
Cryogenic microsystems that utilize different 3D integration techniques are being actively developed, e.g., for the needs of quantum technologies. 3D integration can introduce oppo…
Phonon-blocked junction refrigerators for cryogenic quantum devices
E. Mykkänen, J. S. Lehtinen, A. Ronzani +4
Refrigeration is an important enabler for quantum technology. The very low energy of the fundamental excitations typically utilized in quantum technology devices and systems requir…