Experimental Realization of a Differential Charge Qubit
Matthew D. Shaw, Justin F. Schneiderman, B. S. Palmer, Per Delsing, P. M. Echternach · IEEE Transactions on Applied Superconductivity · 2007
We demonstrate the operation of a differential single Cooper-pair box, a charge qubit consisting of two aluminum islands, isolated from ground, coupled by a pair of small-area Josephson junctions. We have tested four devices, all of which show evidence of quasiparticle poisoning. The devices are characterized with microwave spectroscopy and temperature dependence studies.