Inelastic Microwave Photon Scattering off a Quantum Impurity in a Josephson-Junction Array
Moshe Goldstein, Michel H. Devoret, Manuel Houzet, Leonid I. Glazman
DOI 10.1103/PhysRevLett.110.017002 · Physical Review Letters
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Abstract
Quantum fluctuations in an anharmonic superconducting circuit enable 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 elastic and inelastic photon scattering cross sections. These cross sections reveal many-body properties of the Kondo problem that are hard to access in its traditional fermionic version.
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