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

Mathias J. R. Staunstrup, Alexey Tiranov, Ying Wang, Sven Scholz, Andreas D. Wieck, Arne Ludwig, Leonardo Midolo, Nir Rotenberg, Peter Lodahl () and Hanna Le Jeannic ()
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Mathias J. R. Staunstrup: University of Copenhagen
Alexey Tiranov: University of Copenhagen
Ying Wang: University of Copenhagen
Sven Scholz: Universitätsstraße 150
Andreas D. Wieck: Universitätsstraße 150
Arne Ludwig: Universitätsstraße 150
Leonardo Midolo: University of Copenhagen
Nir Rotenberg: University of Copenhagen
Peter Lodahl: University of Copenhagen
Hanna Le Jeannic: University of Copenhagen

Nature Communications, 2024, vol. 15, issue 1, 1-5

Abstract: Abstract Realizing a sensitive photon-number-dependent phase shift on a light beam is required both in classical and quantum photonics. It may lead to new applications for classical and quantum photonics machine learning or pave the way for realizing photon-photon gate operations. Nonlinear phase-shifts require efficient light-matter interaction, and recently quantum dots coupled to nanophotonic devices have enabled near-deterministic single-photon coupling. We experimentally realize an optical phase shift of 0.19π ± 0.03 radians ( ≈ 34 degrees) using a weak coherent state interacting with a single quantum dot in a planar nanophotonic waveguide. The phase shift is probed by interferometric measurements of the light scattered from the quantum dot in the waveguide. The process is nonlinear in power, the saturation at the single-photon level and compatible with scalable photonic integrated circuitry. The work may open new prospects for realizing high-efficiency optical switching or be applied for proof-of-concept quantum machine learning or quantum simulation demonstrations.

Date: 2024
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DOI: 10.1038/s41467-024-51805-9

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