Stationary light pulses and narrowband light storage in a laser-cooled   ensemble loaded into a hollow-core fiber
  We report on the first observation of stationary light pulses and narrowband light storage inside a hollow-core photonic crystal fiber. Laser-cooled atoms were first loaded into the fiber core providing strong light-matter coupling. Light pulses were then stored in a collective atomic excitation using a single control laser beam. By applying a second counterpropagating control beam, a light pulse could be brought to a standstill. Our work paves the way towards the creation of strongly-correlated many-body systems with photons and applications in the field of quantum information processing. 
Frank Blatt, Lachezar S. Simeonov, Thomas Halfmann, and Thorsten   Peters
quant-ph physics.atom-ph