MACROSCOPIC QUANTUM COHERENCE IN JOSEPHSON SYSTEMS
B. Ruggiero, Valentina Corato, E. Esposito +4 more
We present our recent experiments on macroscopic tunneling in the quantum regime for underdamped Josephson junctions with different classical-quantum crossover temperatures. These experiments are performed towards the observation of macroscopic quantum coherence in Josephson systems. A new method to measure coherence in a two-level system based on the adiabatic inversion in an rf squid, is presented. This approach could open new perspectives in view of realization of an elementary quantum bit.
International Journal of Modern Physics B•Oct 30, 2000•4 citations