期刊
NATURE PHYSICS
卷 7, 期 2, 页码 159-165出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHYS1837
关键词
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资金
- NSF
- DoD NSSEFF
- Northrop Grumman Aerospace Systems
- ARO
- IARPA
- Caltech Tolman Postdoctoral Fellowship
Cavity quantum electrodynamics provides the setting for quantum control of strong interactions between a single atom and one photon. Many such atom-cavity systems interacting by coherent exchanges of single photons could be the basis for scalable quantum networks. However, moving beyond current proof-of-principle experiments involving just one or two conventional optical cavities requires the localization of individual atoms at distances less than or similar to 100 nm from a resonator's surface. In this regime an atom can be strongly coupled to a single intracavity photon while at the same time experiencing significant radiative interactions with the dielectric boundaries of the resonator. Here, we report using real-time detection and high-bandwidth feedback to select and monitor single caesium atoms located similar to 100 nm from the surface of a microtoroidal optical resonator. Strong radiative interactions of atom and cavity field probe atomic motion through the evanescent field of the resonator and reveal both the significant role of Casimir-Polder attraction and the manifestly quantum nature of the atom-cavity dynamics.
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