Observation of Resonant Tunneling between Macroscopically Distinct Quantum Levels

作者：Ruth Rouse, Siyuan Han, James E. Lukens · 发表于：Physical Review Letters · 年份：1995 · DOI：10.1103/physrevlett.75.1614 · 被引用次数：206 · 研究领域：Physics of Superconductivity and Magnetism、Quantum and electron transport phenomena、Quantum, superfluid, helium dynamics

We report the first observation of resonant tunneling of a system between two macroscopically distinct states: energy levels in different fluxoid wells of a weakly damped superconducting quantum interference device which differ in mean current by approximately 6 \ensuremath{\mu}A. Near 50 mK, the tunneling rate $\ensuremath{\gamma}({\ensuremath{\Phi}}_{x})$ from the metastable well vs applied flux ${\ensuremath{\Phi}}_{x}$ is found to exhibit a series of local maxima where the levels (spaced by $\ensuremath{\approx}1.9$ K) in the two wells cross. The positions of these maxima agree well with the level crossings calculated using independently determined system parameters.