Article (Scientific journals)
Cooperative spontaneous emission from indistinguishable atoms in arbitrary motional quantum states
Damanet, François; Braun, Daniel; Martin, John
2016In Physical Review. A, Atomic, molecular, and optical physics, 94, p. 033838
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Abstract :
[en] We investigate superradiance and subradiance of indistinguishable atoms with quantized motional states, starting with an initial total state that factorizes over the internal and external degrees of freedom of the atoms. Due to the permutational symmetry of the motional state, the cooperative spontaneous emission, governed by a recently derived master equation [F. Damanet et al., Phys. Rev. A 93, 022124 (2016)], depends only on two decay rates γ and γ0 and a single parameter dd describing the dipole-dipole shifts. We solve the dynamics exactly for N = 2 atoms, numerically for up to 30 atoms, and obtain the large-N limit by a mean-field approach. We find that there is a critical difference γ0 − γ that depends on N beyond which superradiance is lost. We show that exact nontrivial dark states (i.e., states other than the ground state with vanishing spontaneous emission) only exist for γ = γ0 and that those states (dark when γ = γ0) are subradiant when γ < γ0.
Disciplines :
Physics
Author, co-author :
Damanet, François  ;  Université de Liège > Département de physique > Optique quantique
Braun, Daniel;  Institut für theoretische Physik, Universität Tübingen, 72076 Tübingen, Germany
Martin, John  ;  Université de Liège > Département de physique > Optique quantique
Language :
English
Title :
Cooperative spontaneous emission from indistinguishable atoms in arbitrary motional quantum states
Publication date :
September 2016
Journal title :
Physical Review. A, Atomic, molecular, and optical physics
ISSN :
1050-2947
eISSN :
1094-1622
Publisher :
American Physical Society
Volume :
94
Pages :
033838
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique
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since 23 September 2016

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