Reply to the Letter of Orlowska et al.

Non-Markovian signatures in the current noise of a charge qubit

“…Taking the full z-dependence of the rates, non-Markovian contributions are included, and we find the so-called coherent regime [8,10]. The Fano factor is again symmetric, but now super-poissonian (solid black curve) [5]. Including coupling to the phonon bath (g > 0), we are in the phonon-assisted regime, where electron tunneling between the dots is assisted by phonon absorption and/or emission.…”

“…Currents fluctuations, in particular the current noise, have been suggested as a useful investigation tool [2,3]. In a recent experiment, fluctuations of the current through two coherently coupled quantum dots were measured [4], and the observed, unexpected super-poissonian noise was subsequently explained as a pure effect of quantum coherence [5]. In the present work, we consider the same system, however, using an approach based on the theory of Full Counting Statistics for systems with Non-Markovian Dynamics (FCSNMD) [6,7].…”

“…2b of Ref. [5]. Coherent regime (solid black line), g = 0 sequential tunneling (black dashed line), phonon-assisted incoherent tunnelling (dashed grey lines), phonon-assisted tunneling (solid grey lines) and, for comparison, perturbative approach in the hybridized basis (dotted lines).…”