Shaping an Itinerant Quantum Field by Dissipation
  We show that inducing sidebands in the emission of a single emitter into a one dimensional waveguide, together with a dissipative re-pumping process, a photon field is cooled down to a squeezed vacuum. Our method does not require to be in the strong coupling regime, works with a continuum of propagating field modes and it may lead to sources of tunable multimode squeezed light in circuit QED systems. 
Diego Porras and Juan Jos\'e Garc\'ia-Ripoll
quant-ph