Spectroscopic Evidence of the Aharonov-Casher Effect in a Cooper Pair Box

M. T. Bell, W. Zhang, L. B. Ioffe, M. E. Gershenson
2016 Physical Review Letters  
We have observed the effect of the Aharonov-Casher (AC) interference on the spectrum of a superconducting system containing a symmetric Cooper pair box (CPB) and a large inductance. By varying the charge n_g induced on the CPB island, we observed oscillations of the device spectrum with the period Δ n_g=2e. These oscillations are attributed to the charge-controlled AC interference between the fluxon tunneling processes in the CPB Josephson junctions. Total suppression of the tunneling (complete
more » ... destructive interference) has been observed for the charge n_g=e(2n+1). The CPB in this regime represents the 4π-periodic Josephson element, which can be used for the development of the parity-protected superconducting qubits.
doi:10.1103/physrevlett.116.107002 pmid:27015505 fatcat:mak3gdewozgjpfgbyvvhzpdrmm