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Purcell-enhanced dipolar interactions in nanostructures

Skljarow, A.; Kübler, H.; Adams, C.S.; Pfau, T.; Löw, R.; Alaeian, H.

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A. Skljarow

H. Kübler

T. Pfau

R. Löw

H. Alaeian


Strong light-induced interactions between atoms are known to cause nonlinearities at a few-photon level, which are crucial for applications in quantum information processing. Compared to free space, the scattering and the light-induced dipolar interaction of atoms can be enhanced by a dielectric environment. For this Purcell effect, either a cavity or a waveguide can be used. Here, we combine the high densities achievable in thermal atomic vapors with an efficient coupling to a slot waveguide. In contrast to free-space interactions, atoms aligned within the slot exhibit repulsive interactions that are further enhanced by a factor of 8 due to the Purcell effect. The corresponding blueshift of the transition frequency of atoms arranged in the essentially one-dimensional geometry vanishes above the saturation, providing a controllable nonlinearity at the few-photon level. The experimental results are in good agreement with Monte Carlo simulations that include the dielectric environment, dipolar interactions, and motional effects. The results pave the way towards a robust scalable platform for quantum nonlinear optics and all-optical quantum information processing at room temperature.


Skljarow, A., Kübler, H., Adams, C., Pfau, T., Löw, R., & Alaeian, H. (2022). Purcell-enhanced dipolar interactions in nanostructures. Physical Review Research, 4(2),

Journal Article Type Article
Acceptance Date May 12, 2022
Online Publication Date May 26, 2022
Publication Date 2022
Deposit Date Jul 19, 2022
Publicly Available Date Jul 19, 2022
Journal Physical Review Research
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 4
Issue 2


Published Journal Article (754 Kb)

Publisher Licence URL

Copyright Statement
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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