title: Macroscopic rotation of photon polarization induced by a single spin.
abstract: Entangling a single spin to the polarization of a single incoming photon, generated by an external source, would open new paradigms in quantum optics such as delayed-photon 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 enhancement by three orders of magnitude of the spin-photon interaction, using a cavity quantum electrodynamics device. A single hole spin 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 ± 6° when the spin is optically initialized in the up or down state. These results open the way towards a spin-based quantum network.
authors: Laboratoire de Photonique et de Nanostructures, CNRS UPR 20, Route de Nozay, 91460 Marcoussis, France.
authors: Christophe
authors: C
authors: Arnold
authors: Laboratoire de Photonique et de Nanostructures, CNRS UPR 20, Route de Nozay, 91460 Marcoussis, France.
authors: Justin
authors: J
authors: Demory
authors: Laboratoire de Photonique et de Nanostructures, CNRS UPR 20, Route de Nozay, 91460 Marcoussis, France.
authors: Vivien
authors: V
authors: Loo
authors: Laboratoire de Photonique et de Nanostructures, CNRS UPR 20, Route de Nozay, 91460 Marcoussis, France.
authors: Aristide
authors: A
authors: Lemaître
authors: Laboratoire de Photonique et de Nanostructures, CNRS UPR 20, Route de Nozay, 91460 Marcoussis, France.
authors: Isabelle
authors: I
authors: Sagnes
authors: Ioffe Physical-Technical Institute of the RAS, 194021 St-Petersburg, Russia.
authors: Mikhaïl
authors: M
authors: Glazov
authors: Laboratoire de Photonique et de Nanostructures, CNRS UPR 20, Route de Nozay, 91460 Marcoussis, France.
authors: Olivier
authors: O
authors: Krebs
authors: Laboratoire de Photonique et de Nanostructures, CNRS UPR 20, Route de Nozay, 91460 Marcoussis, France.
authors: Paul
authors: P
authors: Voisin
authors: 1] Laboratoire de Photonique et de Nanostructures, CNRS UPR 20, Route de Nozay, 91460 Marcoussis, France [2] Département de Physique, Ecole Polytechnique, F-91128 Palaiseau, France.
authors: Pascale
authors: P
authors: Senellart
authors: 1] Laboratoire de Photonique et de Nanostructures, CNRS UPR 20, Route de Nozay, 91460 Marcoussis, France [2] Université Paris Diderot-Paris 7, 75205 Paris CEDEX 13, France.
authors: Loïc
authors: L
authors: Lanco