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

Juan Carlos Sandoval-Santana, Roberto Zamora-Zamora, Rosario Paredes, Victor Romero-Rochín*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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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.

Original languageEnglish
Article number67
Pages (from-to)1-18
Number of pages18
JournalSYMMETRY
Volume13
Issue number1
DOIs
Publication statusPublished - Jan 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • Bose–Einstein condensates
  • Full quantum dynamics
  • Quantum decoherence

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