236 citations · 461 across the 19 of their papers we have counts for
19 papers
SC-1 Etching of Niobium and Titanium Nitride Thin Films
Adrián Gutiérrez-Cruz, K. A. C. Rathnathilaka, Jani M. Taskinen +6
Dry etching techniques, ubiquitous in microelectronics fabrication, often result in challenging levels of undesired collateral plasma-induced damage. In this work, we demonstrate a…
Multiplexed microwave resonators by frequency comb spectroscopy
Angelo Greco, Jukka-Pekka Kaikkonen, Luca Chirolli +4
Coplanar waveguide resonators are central to the thriving field of circuit quantum electrodynamics. Recently, we have demonstrated the generation of a broadband microwave-frequency…
Native-oxide-passivated trilayer junctions for superconducting qubits
Pankaj Sethi, Om Prakash, Jukka-Pekka Kaikkonen +15
Superconducting qubits in today's quantum processing units are typically fabricated with angle-evaporated aluminum--aluminum-oxide--aluminum Josephson junctions. However, there is…
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…
Scalable on-chip multiplexing of silicon single and double quantum dots
Heorhii Bohuslavskyi, Alberto Ronzani, Joel Hätinen +5
Owing to the maturity of complementary metal oxide semiconductor (CMOS) microelectronics, qubits realized with spins in silicon quantum dots (QDs) are considered among the most pro…
Dispersive readout of reconfigurable ambipolar quantum dots in a silicon-on-insulator nanowire
Jingyu Duan, Janne S. Lehtinen, Michael A. Fogarty +8
We report on ambipolar gate-defined quantum dots in silicon on insulator (SOI) nanowires fabricated using a customised complementary metal-oxide-semiconductor (CMOS) process. The a…
Cascaded superconducting junction refrigerators: optimization and performance limits
A. Kemppinen, A. Ronzani, E. Mykkänen +3
We demonstrate highly transparent silicon-vanadium and silicon-aluminum tunnel junctions with relatively low sub-gap leakage current and discuss how a trade-off typically encounter…
Utilization of the Superconducting Transition for Characterizing Low-Quality-Factor Superconducting Resonators
Yu-Cheng Chang, Bayan Karimi, Jorden Senior +5
Characterizing superconducting microwave resonators with highly dissipative elements is a technical challenge, but a requirement for implementing and understanding the operation of…
Tunable photonic heat transport in a quantum heat valve
Alberto Ronzani, Bayan Karimi, Jorden Senior +4
Quantum thermodynamics is emerging both as a topic of fundamental research and as means to understand and potentially improve the performance of quantum devices. A prominent platfo…
Josephson photodetectors via temperature-to-phase conversion
P. Virtanen, A. Ronzani, F. Giazotto
We theoretically investigate the temperature-to-phase conversion (TPC) process occurring in dc superconducting quantum interferometers based on superconductor--normal metal--superc…
Phase-driven collapse of the Cooper condensate in a nanosized superconductor
Alberto Ronzani, Carles Altimiras, Sophie D'Ambrosio +2
Superconductivity can be understood in terms of a phase transition from an uncorrelated electron gas to a condensate of Cooper pairs in which the relative phases of the constituent…
Spectral characteristics of a fully-superconducting SQUIPT
P. Virtanen, A. Ronzani, F. Giazotto
We consider properties of a fully superconducting variant of the superconducting quantum interference proximity transistor magnetic flux sensor. We study the density of states in a…
Normal metal tunnel junction-based superconducting quantum interference proximity transistor: the N-SQUIPT
S. D'Ambrosio, M. Meissner, C. Blanc +2
We report the fabrication and characterization of an alternative design for a superconducting quantum interference proximity transistor (SQUIPT) based on a normal metal (N) probe.…
Highly-sensitive superconducting quantum interference proximity transistor
A. Ronzani, C. Altimiras, F. Giazotto
We report the design and implementation of a high-performance superconducting quantum interference proximity transistor (SQUIPT) based on aluminum-copper (Al-Cu) technology. With t…
Balanced double-loop mesoscopic interferometer based on Josephson proximity nanojunctions
Alberto Ronzani, Carles Altimiras, Francesco Giazotto
We report on the fabrication and characterization of a two-terminal mesoscopic interferometer based on three V/Cu/V Josephson junctions having nanoscale cross-section. The junction…
MicroSQUIDs based on V/Cu/V Josephson nanojunctions
Alberto Ronzani, Matthieu Baillergeau, Carles Altimiras +1
We report on the fabrication and characterization of microSQUID devices based on nanoscale vanadium/copper/vanadium Josephson weak links. Magnetically driven quantum interference p…