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Observing coherence effects in an overdamped quantum system

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Title: Observing coherence effects in an overdamped quantum system
Authors: Lien, Y-H
Barontini, G
Scheucher, M
Mergenthaler, M
Goldwin, J
Hinds, EA
Item Type: Journal Article
Abstract: It is usually considered that the spectrum of an optical cavity coupled to an atomic medium does not exhibit a normal-mode splitting unless the system satisfies the strong coupling condition, meaning the Rabi frequency of the coherent coupling exceeds the decay rates of atom and cavity excitations. Here we show that this need not be the case, but depends on the way in which the coupled system is probed. Measurements of the reflection of a probe laser from the input mirror of an overdamped cavity reveal an avoided crossing in the spectrum that is not observed when driving the atoms directly and measuring the Purcell-enhanced cavity emission. We understand these observations by noting a formal correspondence with electromagnetically induced transparency of a three-level atom in free space, where our cavity acts as the absorbing medium and the coupled atoms play the role of the control field.
Issue Date: 21-Dec-2016
Date of Acceptance: 15-Nov-2016
URI: http://hdl.handle.net/10044/1/42269
DOI: http://dx.doi.org/10.1038/ncomms13933
ISSN: 2041-1723
Publisher: Nature Publishing Group
Journal / Book Title: Nature Communications
Volume: 7
Copyright Statement: © 2016 The Authors. This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Keywords: MD Multidisciplinary
Publication Status: Published
Article Number: 13933 (2016)
Appears in Collections:Quantum Optics and Laser Science
Physics
Faculty of Natural Sciences



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