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arXiv · 0709.4097

Current to frequency conversion in a Josephson circuit

F. Nguyen·N. Boulant·G. Ithier·P. Bertet·H. Pothier·D. Vion·D. Esteve
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Abstract

The voltage oscillations which occur in an ideally current-biased Josephson junction, were proposed to make a current standard for metrology. We demonstrate similar oscillations in a more complex Josephson circuit derived from the Cooper pair box: the quantronium. When a constant current I is injected in the gate capacitor of this device, oscillations develop at the frequency fB=I/2e, with e the electron charge. We detect these oscillations through the sidebands induced at multiples of fB in the spectrum of a microwave signal reflected on the circuit, up to currents I exceeding 100 pA. We discuss the potential interest of this current to frequency conversion experiment for metrology.

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F. Nguyen, N. Boulant, G. Ithier, P. Bertet, H. Pothier, D. Vion, D. Esteve. 2007-09-26. Current to frequency conversion in a Josephson circuit. https://doi.org/10.1103/physrevlett.99.187005

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