Entangled collective-spin states of atomic ensembles under nonuniform atom-light interaction
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PhysRevA.92.063816.pdf
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Author(s)
Hu, Jiazhong
Chen, Wenlan
Zhang, Hao
Vendeiro, Zachary Michael
Vuletic, Vladan
Date Issued
December 2015
Journal
Physical Review A
Publisher
American Physical Society
Citation
Hu, Jiazhong, Wenlan Chen, Zachary Vendeiro, Hao Zhang, and Vladan Vuletic. "Entangled collective-spin states of atomic ensembles under nonuniform atom-light interaction." Phys. Rev. A 92, 063816 (December 2015). © 2015 American Physical Society
Version
Final published version
Abstract
We consider the optical generation and characterization of entanglement in atomic ensembles under nonuniform interaction between the ensemble and an optical mode. We show that for a wide range of parameters a system of nonuniformly coupled atomic spins can be described as an ensemble of uniformly coupled spins with a reduced effective atom-light coupling and a reduced effective atom number, with a reduction factor of order unity given by the ensemble-mode geometry. This description is valid even for complex entangled states with arbitrary phase-space distribution functions as long as the average total spin remains large, and the detection does not resolve single spins. Furthermore, we derive an analytic formula for determining the observable entanglement in the case, of relevance in practice, where the ensemble-mode coupling differs between state generation and measurement.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Research Laboratory of Electronics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevA.92.063816
