Macroscopic rotation of photon polarization induced by a single spin

Christophe Arnold, Justin Demory, Vivien Loo, Aristide Lemaître, Isabelle Sagnes, Mikhaïl Glazov, Olivier Krebs, Paul Voisin, Pascale Senellart and Loïc Lanco ()
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Christophe Arnold: Laboratoire de Photonique et de Nanostructures, CNRS UPR 20
Justin Demory: Laboratoire de Photonique et de Nanostructures, CNRS UPR 20
Vivien Loo: Laboratoire de Photonique et de Nanostructures, CNRS UPR 20
Aristide Lemaître: Laboratoire de Photonique et de Nanostructures, CNRS UPR 20
Isabelle Sagnes: Laboratoire de Photonique et de Nanostructures, CNRS UPR 20
Mikhaïl Glazov: Ioffe Physical-Technical Institute of the RAS
Olivier Krebs: Laboratoire de Photonique et de Nanostructures, CNRS UPR 20
Paul Voisin: Laboratoire de Photonique et de Nanostructures, CNRS UPR 20
Pascale Senellart: Laboratoire de Photonique et de Nanostructures, CNRS UPR 20
Loïc Lanco: Laboratoire de Photonique et de Nanostructures, CNRS UPR 20

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: 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.

Date: 2015
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DOI: 10.1038/ncomms7236

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