Moshe Goldstein, Michel H. Devoret, Manuel Houzet, Leonid I. Glazman
Quantum fluctuations in an anharmonic superconducting circuit allow for frequency conversion of individual incoming photons. This effect, linear in the photon beam intensity, leads to ramifications for the standard input-output circuit theory. We consider an extreme case of anharmonicity in which photons scatter off a small set of weak links within a Josephson junction array. We show that this quantum impurity displays Kondo physics, and evaluate the inelastic photon scattering cross-sections. These cross-sections reveal many-body properties of the Kondo problem, which are hard to access in its traditional fermionic version.
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http://arxiv.org/abs/1208.0319
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