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arXiv · 1411.6377

Macroscopic Polarization Rotation Induced by a Single Spin

Christophe Arnold·Justin Demory·Vivien Loo·Aristide Lemaître·Isabelle Sagnes·Mikhaïl Glazov·Olivier Krebs·Paul Voisin·Pascale Senellart·Loïc Lanco
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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.

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Christophe Arnold, Justin Demory, Vivien Loo, Aristide Lemaître, Isabelle Sagnes, Mikhaïl Glazov, Olivier Krebs, Paul Voisin, Pascale Senellart, Loïc Lanco. 2014-11-24. Macroscopic Polarization Rotation Induced by a Single Spin. https://doi.org/10.1038/ncomms7236

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