Dynamics of spatial phase coherence in a dissipative Bose–Hubbard atomic system
We investigate the loss of spatial coherence of one-dimensional bosonic gases in optical lattices illuminated by a near-resonant excitation laser. Because the atoms recoil in a random direction after each spontaneous emission, the atomic momentum distribution progressively broadens. Equivalently, th...
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Académie des sciences
2024-03-01
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| Series: | Comptes Rendus. Physique |
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| Online Access: | https://comptes-rendus.academie-sciences.fr/physique/articles/10.5802/crphys.166/ |
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| author | Vatré, Rémy Bouganne, Raphaël Bosch Aguilera, Manel Ghermaoui, Alexis Beugnon, Jérôme Lopes, Raphael Gerbier, Fabrice |
| author_facet | Vatré, Rémy Bouganne, Raphaël Bosch Aguilera, Manel Ghermaoui, Alexis Beugnon, Jérôme Lopes, Raphael Gerbier, Fabrice |
| author_sort | Vatré, Rémy |
| collection | DOAJ |
| description | We investigate the loss of spatial coherence of one-dimensional bosonic gases in optical lattices illuminated by a near-resonant excitation laser. Because the atoms recoil in a random direction after each spontaneous emission, the atomic momentum distribution progressively broadens. Equivalently, the spatial correlation function (the Fourier-conjugate quantity of the momentum distribution) progressively narrows down as more photons are scattered. Here we measure the correlation function of the matter field for fixed distances corresponding to nearest-neighbor (n-n) and next-nearest-neighbor (n-n-n) sites of the optical lattice as a function of time, hereafter called n-n and n-n-n correlators. For strongly interacting lattice gases, we find that the n-n correlator $C_1$ decays as a power-law at long times, $C_1\propto 1/t^{\alpha }$, in stark contrast with the exponential decay expected for independent particles. The power-law decay reflects a non-trivial dissipative many-body dynamics, where interactions change drastically the interplay between fluorescence destroying spatial coherence, and coherent tunnelling between neighboring sites restoring spatial coherence at short distances. The observed decay exponent $\alpha \approx 0.54(6) $ is in good agreement with the prediction $\alpha =1/2$ from a dissipative Bose–Hubbard model accounting for the fluorescence-induced decoherence. Furthermore, we find that the n-n correlator $C_1$ controls the n-n-n correlator $C_2$ through the relation $C_2 \approx C_1^2$, also in accordance with the dissipative Bose–Hubbard model. |
| format | Article |
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| institution | Kabale University |
| issn | 1878-1535 |
| language | English |
| publishDate | 2024-03-01 |
| publisher | Académie des sciences |
| record_format | Article |
| series | Comptes Rendus. Physique |
| spelling | doaj-art-fd9d4ad56473468ebe48038e1c13748b2025-02-07T13:53:12ZengAcadémie des sciencesComptes Rendus. Physique1878-15352024-03-0124S326328410.5802/crphys.16610.5802/crphys.166Dynamics of spatial phase coherence in a dissipative Bose–Hubbard atomic systemVatré, Rémy0Bouganne, Raphaël1Bosch Aguilera, Manel2Ghermaoui, Alexis3Beugnon, Jérôme4Lopes, Raphael5Gerbier, Fabrice6Laboratoire Kastler Brossel, Collège de France, CNRS, ENS-PSL University, Sorbonne Université, 11 Place Marcelin Berthelot, 75005 Paris, FranceLaboratoire Kastler Brossel, Collège de France, CNRS, ENS-PSL University, Sorbonne Université, 11 Place Marcelin Berthelot, 75005 Paris, FranceLaboratoire Kastler Brossel, Collège de France, CNRS, ENS-PSL University, Sorbonne Université, 11 Place Marcelin Berthelot, 75005 Paris, FranceLaboratoire Kastler Brossel, Collège de France, CNRS, ENS-PSL University, Sorbonne Université, 11 Place Marcelin Berthelot, 75005 Paris, FranceLaboratoire Kastler Brossel, Collège de France, CNRS, ENS-PSL University, Sorbonne Université, 11 Place Marcelin Berthelot, 75005 Paris, FranceLaboratoire Kastler Brossel, Collège de France, CNRS, ENS-PSL University, Sorbonne Université, 11 Place Marcelin Berthelot, 75005 Paris, FranceLaboratoire Kastler Brossel, Collège de France, CNRS, ENS-PSL University, Sorbonne Université, 11 Place Marcelin Berthelot, 75005 Paris, FranceWe investigate the loss of spatial coherence of one-dimensional bosonic gases in optical lattices illuminated by a near-resonant excitation laser. Because the atoms recoil in a random direction after each spontaneous emission, the atomic momentum distribution progressively broadens. Equivalently, the spatial correlation function (the Fourier-conjugate quantity of the momentum distribution) progressively narrows down as more photons are scattered. Here we measure the correlation function of the matter field for fixed distances corresponding to nearest-neighbor (n-n) and next-nearest-neighbor (n-n-n) sites of the optical lattice as a function of time, hereafter called n-n and n-n-n correlators. For strongly interacting lattice gases, we find that the n-n correlator $C_1$ decays as a power-law at long times, $C_1\propto 1/t^{\alpha }$, in stark contrast with the exponential decay expected for independent particles. The power-law decay reflects a non-trivial dissipative many-body dynamics, where interactions change drastically the interplay between fluorescence destroying spatial coherence, and coherent tunnelling between neighboring sites restoring spatial coherence at short distances. The observed decay exponent $\alpha \approx 0.54(6) $ is in good agreement with the prediction $\alpha =1/2$ from a dissipative Bose–Hubbard model accounting for the fluorescence-induced decoherence. Furthermore, we find that the n-n correlator $C_1$ controls the n-n-n correlator $C_2$ through the relation $C_2 \approx C_1^2$, also in accordance with the dissipative Bose–Hubbard model.https://comptes-rendus.academie-sciences.fr/physique/articles/10.5802/crphys.166/ultracold atomsquantum gasesoptical latticesdecoherence |
| spellingShingle | Vatré, Rémy Bouganne, Raphaël Bosch Aguilera, Manel Ghermaoui, Alexis Beugnon, Jérôme Lopes, Raphael Gerbier, Fabrice Dynamics of spatial phase coherence in a dissipative Bose–Hubbard atomic system Comptes Rendus. Physique ultracold atoms quantum gases optical lattices decoherence |
| title | Dynamics of spatial phase coherence in a dissipative Bose–Hubbard atomic system |
| title_full | Dynamics of spatial phase coherence in a dissipative Bose–Hubbard atomic system |
| title_fullStr | Dynamics of spatial phase coherence in a dissipative Bose–Hubbard atomic system |
| title_full_unstemmed | Dynamics of spatial phase coherence in a dissipative Bose–Hubbard atomic system |
| title_short | Dynamics of spatial phase coherence in a dissipative Bose–Hubbard atomic system |
| title_sort | dynamics of spatial phase coherence in a dissipative bose hubbard atomic system |
| topic | ultracold atoms quantum gases optical lattices decoherence |
| url | https://comptes-rendus.academie-sciences.fr/physique/articles/10.5802/crphys.166/ |
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