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Durham Seminar, Wednesday 8 May 2019

12:00 - 13:00

CG 83

Hamid Ohadi

Hamid Ohadi

Weakly interacting polariton lattices and how to make them stronger

Strong interaction (nonlinearity) between single photons enables quantum photonics, quantum information processing and quantum simulations. A scalable network of strongly interacting photons, where interaction between neighbours can be individually tuned is essential for quantum simulations. Exciton-polaritons (polaritons) are mixed light matter particles resulting from the strong coupling of cavity photons and quantum-well excitons, and a suitable candidate for interacting photons. In this talk, I will first show how microcavity polaritons can condense and acquire a macroscopic phase and spin in the weakly interacting regime. I will show how nonlinearity makes their phases and spins coupled in lattices. I will then show how by locally tuning neighbouring coupling we can make arbitrary Ising -type spin patterns and how a crossover from insulator to superfluid can be observed by globally tuning neighbouring couplings. Finally, I will introduce a new way forward on how we can take microcavity polaritons to the strongly interacting regime using Rydberg polaritons.