Inelastic Photon Scattering off a Josephson Junction at the Schmid Transition - Leonid Glazman

Explore inelastic photon scattering in Josephson junctions at the Schmid transition in this 28-minute conference talk by Leonid Glazman at the Kavli Institute for Theoretical Physics. Delve into the physics of isolated small Josephson junctions, the effects of static polarization charge, and the impact of dissipative environments. Examine the transition from shunting resistors to Josephson junction arrays, and investigate the unique properties of transmons with multiple narrow bands. Analyze the new quantum impurity Hamiltonian and two mechanisms of inelastic photon scattering. Discover how the Schmid transition manifests in the differential inelastic cross-section and compare theoretical predictions with experimental results for the total inelastic cross-section. Conclude with insights into very long Josephson junction arrays, all within the context of transport and efficient energy conversion in quantum systems.

Inelastic photon scattering off a Josephson junction at the Schmid transition
Outline
An isolated small Josephson junction
Adding a static polarization charge
Josephson junction + dissipative environment
Effect of the dissipation
dissipative "environment" = Shunting resistor
Shunted Josephson junction
From shunting resistor to JJ array
Transmon has multiple narrow bands
Towards Schmid transition in circuit QED
A new quantum impurity Hamiltonian
Two mechanisms of inelastic photon scattering
Schmid transition signature in the differential inelastic cross-section
Total inelastic cross-section, theory and experiment
A (very) long JJ array