Waveguide-Coupled Single Collective Excitation of Atomic Arrays
November 24th, 2021 DANIEL HÜMMER Theoretical Quantum-Nano Photonics
ICFO-The Institute of Photonic Sciences

Each week we present and discuss publications out of the world of atomic, molecular and optical (AMO) physics. Topics are of experimental and theoretical relevance.
This week, Daniel Hümmer will present:

Paper: Waveguide-coupled single collective excitation of atomic arrays

Considerable efforts have been recently devoted to combining ultracold atoms and nanophotonic devices to obtain not only better scalability and figures of merit than in free-space implementations, but also new paradigms for atom-photon interactions. 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, we observe a single collective atomic excitation 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.

All interested may join this session.

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Wednesday, November 24, 2021, 12:00. Blue Lecture Room and Online (Zoom)

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