Correlated quantum dynamics of a single atom collisionally coupled to an ultracold finite bosonic ensemble
We explore the correlated quantum dynamics of a single atom, regarded as an open system, with a spatio-temporally localized coupling to a finite bosonic environment. The single atom, initially prepared in a coherent state of low energy, oscillates in a one-dimensional harmonic trap and thereby perio...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2015-01-01
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| Series: | New Journal of Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1367-2630/17/5/053001 |
| _version_ | 1797751260518023168 |
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| author | Sven Krönke Johannes Knörzer Peter Schmelcher |
| author_facet | Sven Krönke Johannes Knörzer Peter Schmelcher |
| author_sort | Sven Krönke |
| collection | DOAJ |
| description | We explore the correlated quantum dynamics of a single atom, regarded as an open system, with a spatio-temporally localized coupling to a finite bosonic environment. The single atom, initially prepared in a coherent state of low energy, oscillates in a one-dimensional harmonic trap and thereby periodically penetrates an interacting ensemble of N _A bosons held in a displaced trap. We show that the inter-species energy transfer accelerates with increasing N _A and becomes less complete at the same time. System-environment correlations prove to be significant except for times when the excess energy distribution among the subsystems is highly imbalanced. These correlations result in incoherent energy transfer processes, which accelerate the early energy donation of the single atom and stochastically favour certain energy transfer channels, depending on the instantaneous direction of transfer. Concerning the subsystem states, the energy transfer is mediated by non-coherent states of the single atom and manifests itself in singlet and doublet excitations in the finite bosonic environment. These comprehensive insights into the non-equilibrium quantum dynamics of an open system are gained by ab initio simulations of the total system with the recently developed multi-layer multi-configuration time-dependent Hartree method for bosons. |
| first_indexed | 2024-03-12T16:44:54Z |
| format | Article |
| id | doaj.art-c8007bb0fb04482aa8d9b15ca2dc296a |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:44:54Z |
| publishDate | 2015-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-c8007bb0fb04482aa8d9b15ca2dc296a2023-08-08T14:16:42ZengIOP PublishingNew Journal of Physics1367-26302015-01-0117505300110.1088/1367-2630/17/5/053001Correlated quantum dynamics of a single atom collisionally coupled to an ultracold finite bosonic ensembleSven Krönke0Johannes Knörzer1Peter Schmelcher2Center for Optical Quantum Technologies, University of Hamburg , Luruper Chaussee 149, 22761 Hamburg, GermanyCenter for Optical Quantum Technologies, University of Hamburg , Luruper Chaussee 149, 22761 Hamburg, GermanyCenter for Optical Quantum Technologies, University of Hamburg , Luruper Chaussee 149, 22761 Hamburg, Germany; The Hamburg Centre for Ultrafast Imaging, University of Hamburg , Luruper Chaussee 149, 22761 Hamburg, GermanyWe explore the correlated quantum dynamics of a single atom, regarded as an open system, with a spatio-temporally localized coupling to a finite bosonic environment. The single atom, initially prepared in a coherent state of low energy, oscillates in a one-dimensional harmonic trap and thereby periodically penetrates an interacting ensemble of N _A bosons held in a displaced trap. We show that the inter-species energy transfer accelerates with increasing N _A and becomes less complete at the same time. System-environment correlations prove to be significant except for times when the excess energy distribution among the subsystems is highly imbalanced. These correlations result in incoherent energy transfer processes, which accelerate the early energy donation of the single atom and stochastically favour certain energy transfer channels, depending on the instantaneous direction of transfer. Concerning the subsystem states, the energy transfer is mediated by non-coherent states of the single atom and manifests itself in singlet and doublet excitations in the finite bosonic environment. These comprehensive insights into the non-equilibrium quantum dynamics of an open system are gained by ab initio simulations of the total system with the recently developed multi-layer multi-configuration time-dependent Hartree method for bosons.https://doi.org/10.1088/1367-2630/17/5/053001ultracold bosonsbosonic mixturesbeyond-mean-field dynamicsopen quantum systemssystem-environment correlations03.75.Gg |
| spellingShingle | Sven Krönke Johannes Knörzer Peter Schmelcher Correlated quantum dynamics of a single atom collisionally coupled to an ultracold finite bosonic ensemble New Journal of Physics ultracold bosons bosonic mixtures beyond-mean-field dynamics open quantum systems system-environment correlations 03.75.Gg |
| title | Correlated quantum dynamics of a single atom collisionally coupled to an ultracold finite bosonic ensemble |
| title_full | Correlated quantum dynamics of a single atom collisionally coupled to an ultracold finite bosonic ensemble |
| title_fullStr | Correlated quantum dynamics of a single atom collisionally coupled to an ultracold finite bosonic ensemble |
| title_full_unstemmed | Correlated quantum dynamics of a single atom collisionally coupled to an ultracold finite bosonic ensemble |
| title_short | Correlated quantum dynamics of a single atom collisionally coupled to an ultracold finite bosonic ensemble |
| title_sort | correlated quantum dynamics of a single atom collisionally coupled to an ultracold finite bosonic ensemble |
| topic | ultracold bosons bosonic mixtures beyond-mean-field dynamics open quantum systems system-environment correlations 03.75.Gg |
| url | https://doi.org/10.1088/1367-2630/17/5/053001 |
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