Nguyen, F., Boulant, N., Ithier, Grégoire, Bertet, P., Pothier, H., Vion, D. and Esteve, D. (2007) Current to frequency conversion in a Josephson circuit. Physical Review Letters, 99 (18).
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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 f(B)=I/2e, with e the electron charge. We detect these oscillations through the sidebands induced at multiples of f(B) 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.
This is a Submitted version This version's date is: 2/11/2007 This item is not peer reviewed
https://repository.royalholloway.ac.uk/items/0b4b8854-e0f4-101f-0148-410ba955188a/6/
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