In recent years we have witnessed an impressive development in the field of circuit quantum electrodynamics (QED), which has reached the level of control of trapped ions technology. A landmark in circuit QED is the ultrastrong coupling regime of light-matter interaction where the coupling strength is comparable to the resonator frequency. A natural question is whether we can benefit from this coupling regime for the sake of quantum information tasks. This talk will present some contributions regarding this matter. In particular, I will show the performance of ultrafast quantum gates, quantum memory based on parity protected two-level systems, and the engineering of polariton states.

Guillermo Romero received his PhD degree (2009) from the University of Santiago of Chile. In 2010-2015, he was a postdoctoral researcher at the University of the Basque Country, Bilbao, Spain. Since March 2015, he has been an Assistant Professor in the University of Santiago of Chile. His research focus on circuit quantum electrodynamics, superconducting circuits, and condensed matter physics applied to quantum information processing.