期刊
NATURE
卷 566, 期 7744, 页码 359-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41586-019-0902-3
关键词
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资金
- European Research Council (Starting grant HybridNet)
- Emergence programme from Ville de Paris (project NanoQIP)
- DIM Nano-K from Region Ile-de-France
- PERSU programme from Sorbonne Universite [ANR-11-IDEX-0004-02]
- EU [659337, 705161]
- Marie Curie Actions (MSCA) [659337, 705161] Funding Source: Marie Curie Actions (MSCA)
Considerable efforts have been recently devoted to combining ultracold atoms and nanophotonic devices(1-4) to obtain not only better scalability and figures of merit than in free-space implementations, but also new paradigms for atom-photon interactions(5). Dielectric waveguides offer a promising platform for such integration because they enable tight transverse confinement of the propagating light, strong photon-atom coupling in single-pass configurations and potentially long-range atom-atom interactions mediated by the guided photons. However, the preparation of non-classical quantum states in such atom-waveguide interfaces has not yet been realized. Here, by using arrays of individual caesium atoms trapped along an optical nanofibre(6,7), we observe a single collective atomic excitation(8,9) coupled to a nanoscale waveguide. The stored collective entangled state can be efficiently read out with an external laser pulse, leading to on-demand emission of a single photon into the guided mode. We characterize the emitted single photon via the suppression of the two-photon component and confirm the single character of the atomic excitation, which can be retrieved with an efficiency of about 25%. Our results demonstrate a capability that is essential for the emerging field of waveguide quantum electrodynamics, with applications to quantum networking, quantum nonlinear optics and quantum many-body physics(10,11).
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