Single atom optical gate and single photon source based on magnetooptical effects in a waveguide

We have discovered abnormally strong influence of the magnetic field on the optical properties of atomic ensemble confined in a waveguide. We demonstrate qualitative changes in the character of spontaneous emission and single-atom susceptibility. Based on the revealed effects, we propose a new scheme of true single photon source. Furthermore, we propose the highly-efficient optical gate using just one atom.