Dartmouth Events

Title: "Quantum Non-linear Dynamics of Photons and Cooper-pairs in a Superconducting Circuit"

Abstract: Embedding a voltage-biased Josephson junction within a high-Q superconducting microwave cavity provides a way of exploring strongly non-linear quantum dynamics. The cavity is pumped to a far from equilibrium state at resonances where the energy given to a tunnelling Cooper pair by the voltage bias is equal to a multiple of the cavity photon frequency. Intriguingly, the pumping produced by the flow of Cooper pairs can produce non-classical states in the cavity. In this talk I will describe a simple theoretical model for this type of system and outline how the coupled dynamics of the cavity photons and Cooper-pairs can be uncovered using a combination of analytical approximations and numerical methods.