Intrinsic decoherence and recurrences in a large ferromagnetic f = 1 spinor bose–einstein condensate

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2021-01
Major/Subject
Mcode
Degree programme
Language
en
Pages
18
1-18
Series
SYMMETRY, Volume 13, issue 1
Abstract
Decoherence with recurrences appear in the dynamics of the one-body density matrix of an F = 1 spinor Bose–Einstein condensate, initially prepared in coherent states, in the presence of an external uniform magnetic field and within the single mode approximation. The phenomenon emerges as a many-body effect of the interplay of the quadratic Zeeman effect, which breaks the rotational symmetry, and the spin-spin interactions. By performing full quantum diagonalizations, a very accurate time evolution of large condensates is analyzed, leading to heuristic analytic expressions for the time dependence of the one-body density matrix, in the weak and strong interacting regimes, for initial coherent states. We are able to find accurate analytical expressions for both the decoherence and the recurrence times, in terms of the number of atoms and strength parameters, which show remarkable differences depending on the strength of the spin-spin interactions. The features of the stationary states in both regimes are also investigated. We discuss the nature of these limits in light of the thermodynamic limit.
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Keywords
Bose–Einstein condensates, Full quantum dynamics, Quantum decoherence
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Citation
Sandoval-Santana , J C , Zamora-Zamora , R , Paredes , R & Romero-Rochín , V 2021 , ' Intrinsic decoherence and recurrences in a large ferromagnetic f = 1 spinor bose–einstein condensate ' , SYMMETRY , vol. 13 , no. 1 , 67 , pp. 1-18 . https://doi.org/10.3390/sym13010067