Low-Noise Current Amplifier Based on Mesoscopic Josephson Junction

Josephson junction 0103 physical sciences 02 engineering and technology 0210 nano-technology 01 natural sciences 7. Clean energy
DOI: 10.1126/science.299.5609.1045 Publication Date: 2003-02-13T22:06:30Z
ABSTRACT
We used 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 created transistor-like devices, Bloch oscillating transistors, with considerable current gain and high-input impedance. In these transistors, the correlated supercurrent of Cooper pairs is controlled by a small base current made up of single electrons. Our devices reached current and power gains on the order of 30 and 5, respectively. The noise temperature was estimated to be around 1 kelvin, but noise temperatures of less than 0.1 kelvin can be realistically achieved. These devices provide quantum-electronic building blocks that will be useful at low temperatures in low-noise circuit applications with an intermediate impedance level.
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