Macroscopic Polarization Rotation Induced by a Single Spin
Abstract
Solid-state spins hold many promises for quantum information processing. Entangling the polarization of a single photon to the state of a single spin would open new paradigms in quantum optics like delayed-photons entanglement, deterministic logic gates or fault-tolerant quantum computing. These perspectives rely on the possibility that a single spin induces a macroscopic rotation of a photon polarization. Such polarization rotations induced by single spins were recently observed, yet limited to a few 10-3 degrees, due to poor spin-photon coupling. Here we report the amplification by three orders of magnitude of the spin-photon interaction, using a cavity quantum electrodynamics device. A single hole spin trapped in a semiconductor quantum dot is deterministically coupled to a micropillar cavity. The cavity-enhanced coupling between the incoming photons and the solid-state spin results in a polarization rotation by \pm 6 degrees when the spin is optically initialized in either the up or down state. These results open the way towards a spin-based quantum network.
Cite
@article{arxiv.1411.6377,
title = {Macroscopic Polarization Rotation Induced by a Single Spin},
author = {Christophe Arnold and Justin Demory and Vivien Loo and Aristide Lemaître and Isabelle Sagnes and Mikhaïl Glazov and Olivier Krebs and Paul Voisin and Pascale Senellart and Loïc Lanco},
journal= {arXiv preprint arXiv:1411.6377},
year = {2015}
}