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We develop an exact non-perturbative framework to compute steady-stateproperties of quantum-impurities subject to a finite bias. We show that thesteady-state physics of these systems is captured by nonequilibrium scatteringeigenstates which satisfy an appropriate Lippman-Schwinger equation.Introducing a generalization of the equilibrium Bethe-Ansatz - theNonequilibrium Bethe-Ansatz (NEBA), we explicitly construct the scatteringeigenstates for the Interacting Resonance Level model and derive exact,nonperturbative results for the steady-state properties of the system.Comment: 4 pages, 1 figur

Nonequilibrium Transport in Quantum Impurity Models: The Bethe Ansatz for Open Systems