
1.Department of Physics and IRIS Adlershof, Humboldt-Universität zu Berlin, 12489 Berlin, Germany
2.Chair in Hybrid Nanosystems, Nanoinstitute Munich, Faculty of Physics, Ludwig-Maximilians-Universität München, 80539 Munich, Germany
3.Department of Fiber Photonics, Leibniz Institute of Photonic Technology, 07745 Jena, Germany
4.Competence Center for Micro- and Nanotechnologies, Leibniz Institute of Photonic Technology Jena, 07745 Jena, Germany
5.Department of Physics, Imperial College London, London SW7 2AZ, UK
6.5. Physikalisches Institut and Center for Integrated Quantum Science and Technology, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany
7.Otto Schott Institute of Material Research, 07743 Jena, Germany
Tim Kroh (tim.kroh@physik.hu-berlin.de)
Published:31 July 2021,
Published Online:31 May 2021,
Received:25 January 2021,
Revised:03 May 2021,
Accepted:17 May 2021
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Davidson-Marquis, F. et al. Coherent interaction of atoms with a beam of light confined in a light cage. Light: Science & Applications, 10, 1247-1256 (2021).
Davidson-Marquis, F. et al. Coherent interaction of atoms with a beam of light confined in a light cage. Light: Science & Applications, 10, 1247-1256 (2021). DOI: 10.1038/s41377-021-00556-z.
Controlling coherent interaction between optical fields and quantum systems in scalable
integrated platforms is essential for quantum technologies. Miniaturised
warm alkali-vapour cells integrated with on-chip photonic devices represent an attractive system
in particular for delay or storage of a single-photon quantum state. Hollow-core fibres or planar waveguides are widely used to confine light over long distances enhancing light-matter interaction in atomic-vapour cells. However
they suffer from inefficient filling times
enhanced dephasing for atoms near the surfaces
and limited light-matter overlap. We report here on the observation of modified electromagnetically induced transparency for a non-diffractive beam of light in an on-chip
laterally-accessible hollow-core light cage. Atomic layer deposition of an alumina nanofilm onto the light-cage structure was utilised to precisely tune the high-transmission spectral region of the light-cage mode to the operation wavelength of the atomic transition
while additionally protecting the polymer against the corrosive alkali vapour. The experiments show strong
coherent light-matter coupling over lengths substantially exceeding the Rayleigh range. Additionally
the stable non-degrading performance and extreme versatility of the light cage provide an excellent basis for a manifold of quantum-storage and quantum-nonlinear applications
highlighting it as a compelling candidate for all-on-chip
integrable
low-cost
vapour-based photon delay.
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