Quantum Optics Seminar by Juan José García Ripoll

Quantum microwave photonics

In this talk I will review our work with propagating quantum microwaves in superconducting circuits. The talk revolves around the notion of ultrastrong coupling and how this is achieved between superconducting qubits and propagating photons. I will review non-perturbative methods that we use to study these systems [2] and how we apply them for the characterization of actual experiments [1]. The talk will close with some ideas on the limitations of current spectroscopic methods and how we can improve them to learn about multiphoton processes [3]. 

[1] Ultrastrong coupling of a single artificial atom to an electromagnetic continuum in the nonperturbative regime, P. Forn-Díaz, J. J. García-Ripoll, B. Peropadre, M. A. Yurtalan, J.-L. Orgiazzi, R. Belyansky, C. M. Wilson, A. Lupascu, Nature Physics 13, 39 (2017)

[2] Ultrastrong coupling few-photon scattering theory, Tao Shi, Yue Chang, Juan Jose Garcia-Ripoll, arXiv:1701.04709

[3] Multi-photon scattering tomography with coherent states, Tomás Ramos, Juan José García-Ripoll, arXiv:1705.10211, to appear in PRL