TL;DR
This paper demonstrates a quantum optics simulation of Kondo physics using superconducting devices, revealing a many-body resonance and conditions for asymptotic freedom of microwave photons.
Contribution
It introduces a novel emulation of renormalization group models like the Kondo model with superconducting circuits, connecting quantum optics and many-body physics.
Findings
Identification of a many-body resonance in microwave photon propagation.
Observation of the disappearance of the transmission peak at high input amplitudes.
Demonstration of asymptotic freedom in microwave light at low temperatures.
Abstract
We emulate renormalization group models, such as the Spin-Boson Hamiltonian or the anisotropic Kondo model, from a quantum optics perspective by considering a superconducting device. The infra-red confinement involves photon excitations of two tunable transmission lines entangled to an artificial spin-1/2 particle or double-island charge qubit. Focusing on the propagation of microwave light, in the underdamped regime of the Spin-Boson model, we identify a many-body resonance where a photon is absorbed at the renormalized qubit frequency and reemitted forward in an elastic manner. We also show that asymptotic freedom of microwave light is reached by increasing the input signal amplitude at low temperatures which allows the disappearance of the transmission peak.
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