Physics

Direct observation of a few-photon phase shift induced by a single quantum emitter in a waveguide

M. J. R. Staunstrup, A. Tiranov, et al.

This groundbreaking research by Mathias J. R. Staunstrup and colleagues unveils an optical phase shift of 0.19 ± 0.03 radians when a weak coherent state interacts with a single quantum dot in a nanophotonic waveguide. With implications for high-efficiency optical switching and quantum machine learning, this work paves the way for future advancements in photonic integrated circuitry.

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Abstract

This paper experimentally demonstrates an optical phase shift of 0.19 ± 0.03 radians (≈34 degrees) using a weak coherent state interacting with a single quantum dot in a planar nanophotonic waveguide. The phase shift, probed interferometrically, is nonlinear in power, saturates at the single-photon level, and is compatible with scalable photonic integrated circuitry. This work opens prospects for high-efficiency optical switching and applications in quantum machine learning and quantum simulation.

Publisher

Nature Communications

Published On

Aug 31, 2024

Authors

Mathias J. R. Staunstrup, Alexey Tiranov, Ying Wang, Sven Scholz, Andreas D. Wieck, Arne Ludwig, Leonardo Midolo, Nir Rotenberg, Peter Lodahl, Hanna Le Jeannic

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