Widera, ArturTrotsky, StefanCheinet, PatrickFolling, SimonGerbier, FabriceBloch, ImmanuelGritsev, VladimirLukin, MikhailDemler, Eugene2012-01-102008Widera, Artur, Stefan Trotzky, Patrick Cheinet, Simon Fölling, Fabrice Gerbier, Immanuel Bloch, Vladimir Gritsev, Mikhail Lukin, and Eugene Demler. 2008. Quantum spin dynamics of mode-squeezed Luttinger liquids in two-component atomic gases. Physical Review Letters 100(14): 140401.0031-9007http://nrs.harvard.edu/urn-3:HUL.InstRepos:7479990We report on the observation of the phase dynamics of interacting one-dimensional ultracold bosonic gases with two internal degrees of freedom. By controlling the non-linear atomic interactions close to a Feshbach resonance we are able to induce a phase diffusive many-body spin dynamics. We monitor this dynamical evolution by Ramsey interferometry, supplemented by a novel, many-body echo technique. We find that the time evolution of the system is well described by a Luttinger liquid initially prepared in a multimode squeezed state. Our approach allows us to probe the non-equilibrium evolution of one-dimensional many-body quantum systems.en-USJournal Article2012-01-1010.1103/PhysRevLett.100.140401