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Experimental determination of the Berry phase in a superconducting charge pump
Mikko Mottonen, Juha J. Vartiainen, Jukka P. Pekola
We present the first measurements of the Berry phase in a superconducting Cooper pair pump. A fixed amount of Berry phase is accumulated to the quantum-mechanical ground state in e…
Hybrid single-electron transistor as a source of quantized electric current
Jukka P. Pekola, Juha J. Vartiainen, Mikko Mottonen +3
The basis of synchronous manipulation of individual electrons in solid-state devices was laid by the rise of single-electronics about two decades ago. Ultra-small structures in a l…
Vortex pump for dilute Bose-Einstein condensates
Mikko Mottonen, Ville Pietila, Sami M. M. Virtanen
The formation of vortices by topological phase engineering has been realized experimentally to create the first two- and four-quantum vortices in dilute atomic Bose-Einstein conden…
Suppression of 1/f noise in one-qubit systems
Pekko Kuopanportti, Mikko Mottonen, Ville Bergholm +3
We investigate the generation of quantum operations for one-qubit systems under classical noise with 1/f^αpower spectrum, where 2>α> 0. We present an efficient way to approximate t…
Heat Transistor: Demonstration of Gate-Controlled Electron Refrigeration
Olli-Pentti Saira, Matthias Meschke, Francesco Giazotto +3
We present experiments on a superconductor-normal metal electron refrigerator in a regime where single-electron charging effects are significant. The system functions as a heat tra…
Stability and dynamics of vortex clusters in nonrotated Bose-Einstein condensates
V. Pietila, M. Mottonen, T. Isoshima +2
We study stationary clusters of vortices and antivortices in dilute pancake-shaped Bose-Einstein condensates confined in nonrotating harmonic traps. Previous theoretical results on…