February 1, 2020 at 10:30 pm

Physics Colloquium | Quantum Electrodynamics of Superconducting Circuits, Feb. 7

The Physics & Astronomy Colloquium Series presents Hakan Tureci, of Princeton University on “Quantum Electrodynamics of Superconducting Circuits”, on Friday, Feb. 7, at 4:10 p.m. in Clippinger Labs 194.

Photo of Hakan Tureci

Hakan Tureci

Abstract: The demand for rapid and high-fidelity execution of initialization, gate and read-out operations casts tight constraints on the accuracy of quantum electrodynamic modeling of superconducting integrated  circuits. In particular, radiative corrections to the properties of superconducting qubits, such as their transition frequency (Lamb shift) and the radiative decay rate (Purcell rate) have to be calculated to a high accuracy. In the pursuit of attaining the required accuracies we have found ourselves facing problems with divergent series akin to those that have plagued the original quantum electrodynamics of a single electron in free space. Interestingly, a semiclassical formulation of the Purcell rate is found to provide finite and accurate results. The reconciliation of the quantum and semiclassical results requires the reconsideration of our basic approach to the quantization of the electromagnetic field in a light-confining medium and the notion of normal modes.

I will discuss a theoretical framework based on the Heisenberg-Langevin approach to address these fundamental questions.

Leave a Reply

Your email address will not be published. Required fields are marked *