2007/09/26 by F. Nguyen, N. Boulant, Nicolas Boulant +8
Computer Science · Engineering · Physics and Astronomy · #Advanced Electrical Measurement Techniques #Mechanical and Optical Resonators #Quantum Information and Cryptography #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevlett.99.187005
published as Physical Review Letters 99, 18 (2007) 187005 · To be published in Physical Review Letters
arxiv created 2007/09/26 · openalex publication_date 2007/11/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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.