Long-range spin-qubit interaction mediated by microcavity polaritons

We study the optically induced coupling between spins mediated by polaritons in a planar microcavity. In the strong-coupling regime, the vacuum Rabi splitting introduces anisotropies in the spin coupling. Moreover, due to their photonlike mass, polaritons provide an extremely long spin coupling range. This suggests the realization of two-qubit all-optical quantum operations within tens of picoseconds with spins localized as far as hundreds of nanometers apart.

This work was supported by the National Science Foundation No. DMR-0605801, the Donald D. Harrington Fellows Program at The University of Texas at Austin, the Spanish Ministry of Education and Generalitat Valenciana for Grants No. FIS200402356 and No. GV05-152 as well as Ramon y Cajal Program.