Low Noise Current Amplifier Based on Mesoscopic Josephson Junction

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Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2003
Major/Subject
Mcode
Degree programme
Language
en
Pages
1-13
Series
Science, Volume 299, Issue 5609
Abstract
We utilize the band structure of a mesoscopic Josephson junction to construct low noise amplifiers. By taking advantage of the quantum dynamics of a Josephson junction, i.e. the interplay of interlevel transitions and the Coulomb blockade of Cooper pairs, we create transistor-like devices, Bloch oscillating transistors, with considerable current gain and high input impedance. In these transistors, correlated supercurrent of Cooper pairs is controlled by a small base current made of single electrons. Our devices reach current and power gains on the order of 30 and 5, respectively. The noise temperature is estimated to be around 1 Kelvin, but it is realistic to achieve TN < 0.1 Kelvin. These devices provide quantum-electronic building blocks that will be useful in low-noise, intermediate-impedance-level circuit applications at low temperatures.
Description
Keywords
Josephson junctions, low-noise amplifiers, band structures
Other note
Citation
Delahaye, Julien & Hassel, J. & Lindell, Rene & Sillanpää, Mika & Paalanen, Mikko & Seppä, Heikki & Hakonen, Pertti J. 2003. Low Noise Current Amplifier Based on Mesoscopic Josephson Junction. Science. Volume 299, Issue 5609. 1-13. DOI: 10.1126/science.299.5609.1045