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arXiv · 2106.13650

Few-photon all-optical phase rotation in a quantum-well micropillar cavity

Tintu Kuriakose·Paul M. Walker·Toby Dowling·Oleksandr Kyriienko·Ivan A. Shelykh·Phillipe St-Jean·Nicola Carlon Zambon·Aristide Lemaître·Isabelle Sagnes·Luc Legratiet·Abdelmounaim Harouri·Sylvain Ravets·Maurice S. Skolnick·Alberto Amo·Jacqueline Bloch·Dmitry N. Krizhanovskii
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Abstract

Photonic platforms are an excellent setting for quantum technologies because weak photon-environment coupling ensures long coherence times. The second key ingredient for quantum photonics is interactions between photons, which can be provided by optical nonlinearities in the form of cross-phase-modulation (XPM). This approach underpins many proposed applications in quantum optics and information processing, but achieving its potential requires strong single-photon-level nonlinear phase shifts and also scalable nonlinear elements. In this work we show that the required nonlinearity can be provided by exciton-polaritons in micropillars with embedded quantum wells. These combine the strong interactions of excitons with the scalability of micrometer-sized emitters. We observe XPM up to $3 \pm 1$ mrad per particle using laser beams attenuated to below single photon average intensity. With our work serving as a first stepping stone, we lay down a route for quantum information processing in polaritonic lattices.

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Tintu Kuriakose, Paul M. Walker, Toby Dowling, Oleksandr Kyriienko, Ivan A. Shelykh, Phillipe St-Jean, Nicola Carlon Zambon, Aristide Lemaître, Isabelle Sagnes, Luc Legratiet, Abdelmounaim Harouri, Sylvain Ravets, Maurice S. Skolnick, Alberto Amo, Jacqueline Bloch, Dmitry N. Krizhanovskii. 2021-06-25. Few-photon all-optical phase rotation in a quantum-well micropillar cavity. https://doi.org/10.1038/s41566-022-01019-6

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