Physics – Condensed Matter – Superconductivity
Scientific paper
2002-06-13
Physical Review Letters 90, 037003 (2003)
Physics
Condensed Matter
Superconductivity
4 pages, 5 figures
Scientific paper
10.1103/PhysRevLett.90.037003
The escape of a small current-biased Josephson tunnel junction from the zero voltage state in the presence of weak microwave radiation is investigated experimentally at low temperatures. The measurements of the junction switching current distribution indicate the macroscopic quantum tunneling of the phase below a cross-over temperature of $T^{\star} \approx 280 \rm{mK}$. At temperatures below $T^{\star}$ we observe both single-photon and \emph{multi-photon} transitions between the junction energy levels by applying microwave radiation in the frequency range between $10 \rm{GHz}$ and $38 \rm{GHz}$ to the junction. These observations reflect the anharmonicity of the junction potential containing only a small number of levels.
Duty Tim
Lukashenko Alexander
Ustinov Alexey V.
Wallraff Andreas
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