Long-range spin-qubit interaction mediated by microcavity polaritons

TL;DR

This paper explores how microcavity polaritons can mediate long-range, optically-controlled spin interactions, enabling fast two-qubit quantum operations over hundreds of nanometers.

Contribution

It demonstrates the potential of polaritons in microcavities to facilitate long-range, anisotropic spin coupling for quantum information processing.

Findings

Vacuum Rabi splitting causes anisotropic spin interactions.

Polaritons enable spin coupling over hundreds of nanometers.

Fast two-qubit operations are feasible within tens of picoseconds.

Abstract

We study the optically-induced coupling between spins mediated by polaritons in a planar micro-cavity. In the strong coupling regime, the vacuum Rabi splitting introduces anisotropies in the spin coupling. Moreover, due to their photon-like 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.