title: Inelastic microwave photon scattering off a quantum impurity in a Josephson-junction array.
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.
authors: Department of Physics, Yale University, New Haven, Connecticut 06520, USA.
authors: Moshe
authors: M
authors: Goldstein
authors: Michel H
authors: MH
authors: Devoret
authors: Manuel
authors: M
authors: Houzet
authors: Leonid I
authors: LI
authors: Glazman