Analysis and Control of Quantum Finite-level Systems Driven by   Single-photon Input States
  Single-photon states, which carry quantum information and coherently interact with quantum systems, are vital to the realization of all-optical engineered quantum networks. In this paper we derive the analytical form of the output field state for a large class of quantum finite-level systems driven by single-photon input field states using a transfer function approach. Single-photon pulse shaping via coherent feedback is also studied. 
Yu Pan, Guofeng Zhang, Matthew R. James
quant-ph