Multiphoton Transitions between Energy Levels in a Current-Biased Josephson Tunnel Junction

A. Wallraff; T. Duty; A. Lukashenko; A. V. Ustinov

doi:10.1103/PhysRevLett.90.037003

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Multiphoton Transitions between Energy Levels in a Current-Biased Josephson Tunnel Junction

A. Wallraff, T. Duty, A. Lukashenko, A. V. Ustinov

DOI 10.1103/PhysRevLett.90.037003 · Physical Review Letters

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Abstract

The escape of a 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 crossover temperature of T⋆≈280 mK. At temperatures below T⋆ we observe both single-photon and multiphoton transitions between the junction energy levels by applying microwave radiation in the frequency range between 10 and 38 GHz to the junction. These observations reflect the anharmonicity of the junction potential containing only a small number of levels.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown