Bang-Bang refocusing of a qubit exposed to telegraph noise

摘要

We investigate the decoherence effect of telegraph noise on a single qubit,usually provoked by bistable fluctuators. To diminish the dephasing andrelaxation impact an effective refocusing scheme (so-called Bang-Bang pulses)is proposed. Detailed numerical as well as analytical random walk analysisallows in particular to evaluate the applicability of non-perfect Bang-Bangpulses.