Topological edge states of interacting photon pairs: topolectrical circuit realization
Speaker:
Maxim Gorlach
ITMO University, Saint Petersburg
Abstract
Recent years have witnessed a rapid development of topological photonics, which offers a number of unique functionalities including disorder-robust one-way propagation of photonic topological modes. While topological states of classical light are relatively well-established, topological states of quantum light still remain largely unexplored promising such appealing perspectives as topological protection of bi-photon correlations and topologically protected quantum logic operations.
In this talk, I will review the results of our group on topological states of repulsively bound photon pairs with the effective photon-photon interaction mediated by the nonlinearity of the medium. Besides in-depth theoretical investigation, we emulate this system experimentally, employing the platform of topolectrical circuits. In particular, we extract the topological invariant directly from the measurements and reconstruct the profile of a topological eigenmode from experimental data.
Additionally, I will mention our results on topological states of classical light such as extraction of the topological invariant from the far-field scattering spectra of a metasurface, photonic spin Hall effect in arrays of bianisotropic disks and optical realization of higher-order topological states in ring resonator arrays.