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Phys Rev Lett. 2007 Apr 13;98(15):153003. Epub 2007 Apr 13.

Strongly correlated two-photon transport in a one-dimensional waveguide coupled to a two-level system.

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Ginzton Laboratory, Stanford University, Stanford, California 94305, USA.


We show that two-photon transport is strongly correlated in one-dimensional waveguide coupled to a two-level system. The exact S matrix is constructed using a generalized Bethe-ansatz technique. We show that the scattering eigenstates of this system include a two-photon bound state that passes through the two-level system as a composite single particle. Also, the two-level system can induce effective attractive or repulsive interactions in space for photons. This general procedure can be applied to the Anderson model as well.

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