Publications [#330530] of Harold U. Baranger

Papers Published

1. Fang, Y-LL; Ciccarello, F; Baranger, HU, Non-Markovian Dynamics of a Qubit Due to Single-Photon Scattering in a Waveguide, New Journal of Physics, vol. 20 no. 4 (April, 2018), pp. 043035-043035, Institute of Physics (IoP) and Deutsche Physikalische Gesellschaft [doi]
   (last updated on 2026/01/16)

   Abstract:
   We investigate the open dynamics of a qubit due to scattering of a single photon in an infinite or semi-infinite waveguide. Through an exact solution of the time-dependent multi-photon scattering problem, we find the qubitʼs dynamical map. Tools of open quantum systems theory allow us then to show the general features of this map, find the corresponding non-Linbladian master equation, and assess in a rigorous way its non-Markovian nature. The qubit dynamics has distinctive features that, in particular, do not occur in emission processes. Two fundamental sources of non-Markovianity are present: the finite width of the photon wavepacket and the time delay for propagation between the qubit and the end of the semi-infinite waveguide.