Decoherence in circuits of small Josephson junctions
Jukka P Pekola, J. Jussi Toppari · Physical review. B, Condensed matter · 2001
We discuss dephasing by the dissipative electromagnetic environment and by measurement in circuits consisting of small Josephson junctions. We present quantitative estimates and determine in which case the circuit might qualify as a quantum bit. Specifically, we analyze a three junction Cooper pair pump and discuss a measurement to determine the decoherence time ${\ensuremath{\tau}}_{\ensuremath{\varphi}}.$