Contactless photon-photon interactions
Prof. Charles Adams, University of Durham, UK
In 2007, it was written that 'no known or foreseen material has an optical nonlinearity strong enough to implement' a large single-photon phase shift , and also we started to study a new ‘material’ where photons couple to highly-excited Rydberg excitations that do exhibit strong interactions . Ten years on, this new material based on ultra-cold Rydberg atoms has been used to demonstrate strong photon-photon interactions, large single-photon phase shifts, and single-photon transistors (see recent review ).
In this talk, I will review the physics of Rydberg quantum optics and discuss our most recent results including a ‘contactless' photon-photon interaction .
 J. L. O’Brien, Science 318, 1567 (2007).
 A. Mohapatra, T. R. Jackson and C. S. Adams, Phys. Rev. Lett. 98, 113003 (2007).
 O. Firstenberg, C. S. Adams, and S. Hofferberth, Nonlinear quantum optics mediated by Rydberg interactions, J. Phys. B 49, 152003 (2016).
 H. Busche et. al. Nature Phys. (to appear).
The Distinguished Lecturer Series (DLS) follows a colloquium format for a broad audience and will be followed by a reception to provide an opportunity for meeting the speaker.