Zobrazeno 1 - 10
of 117
pro vyhledávání: '"Gerbier, Fabrice"'
Autor:
Vatré, Rémy, Bouganne, Raphaël, Aguilera, Manel Bosch, Ghermaoui, Alexis, Beugnon, Jérôme, Lopes, Raphael, Gerbier, Fabrice
Publikováno v:
Comptes Rendus. Physique, Online first (2023), pp. 1-22
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 dis
Externí odkaz:
http://arxiv.org/abs/2405.03226
Autor:
Aguilera, Manel Bosch, Ghermaoui, Alexis, Vatré, Rémy, Bouganne, Raphaël, Beugnon, Jérôme, Gerbier, Fabrice
We report on experiments exploring the non-Hermitian dynamics of pairs of two-level atoms tightly confined in an optical lattice and driven by a near-resonant laser. Although spontaneous emission is negligible for the long-lived excited state, two-bo
Externí odkaz:
http://arxiv.org/abs/2207.02080
Publikováno v:
Phys. Rev. A 103, 031302 (2021)
We present experiments revealing the competing effect of quantum fluctuations and of a coherent seed in the dynamics of a spin-1 Bose-Einstein condensate, and discuss the relevance of a mean-field description of our system. We first explore a near-eq
Externí odkaz:
http://arxiv.org/abs/2101.06716
Autor:
Rossini, Davide, Ghermaoui, Alexis, Aguilera, Manel Bosch, Vatré, Rémy, Bouganne, Raphaël, Beugnon, Jérôme, Gerbier, Fabrice, Mazza, Leonardo
Publikováno v:
Phys. Rev. A 103, 060201 (2021)
We consider strong two-body losses in bosonic gases trapped in one-dimensional optical lattices. We exploit the separation of time scales typical of a system in the many-body quantum Zeno regime to establish a connection with the theory of the time-d
Externí odkaz:
http://arxiv.org/abs/2011.04318
Understanding the ground state of many-body fluids is a central question of statistical physics. Usually for weakly interacting Bose gases, most particles occupy the same state, corresponding to a Bose--Einstein condensate. However, another scenario
Externí odkaz:
http://arxiv.org/abs/2010.15739
Publikováno v:
Phys. Rev. Lett. 126, 063401 (2021)
The dynamics of a many-body system can take many forms, from a purely reversible evolution to fast thermalization. Here we show experimentally and numerically that an assembly of spin 1 atoms all in the same spatial mode allows one to explore this wi
Externí odkaz:
http://arxiv.org/abs/2010.13832
Publikováno v:
Phys. Rev. Lett. 125, 033401 (2020)
Using parametric conversion induced by a Shapiro-type resonance, we produce and characterize a two-mode squeezed vacuum state in a sodium spin 1 Bose-Einstein condensate. Spin-changing collisions generate correlated pairs of atoms in the $m=\pm 1$ Ze
Externí odkaz:
http://arxiv.org/abs/2004.09003
Autor:
Bouganne, Raphaël, Aguilera, Manel Bosch, Ghermaoui, Alexis, Beugnon, Jérôme, Gerbier, Fabrice
Publikováno v:
published as: Anomalous decay of coherence in a dissipative many-body system, Nat. Phys. (2019)
Decoherence is ubiquitous in quantum physics, from the conceptual foundations to quantum information processing or quantum technologies, where it is a threat that must be countered. While decoherence has been extensively studied for simple, well-isol
Externí odkaz:
http://arxiv.org/abs/1905.04808
Publikováno v:
Phys. Rev. A 100, 023604 (2019)
We study the coherent and dissipative aspects of a driven spin-1 Bose-Einstein condensate (BEC) when the Zeeman energy is modulated around a static bias value. Resonances appear when the bias energy matches an integer number of modulation quanta. The
Externí odkaz:
http://arxiv.org/abs/1810.12638
Publikováno v:
New J. Phys. 20, 015004 (2018)
Ultracold bosonic atoms trapped in a two-leg ladder pierced by a magnetic field provide a minimal and quasi-one-dimensional instance to study the interplay between orbital magnetism and interactions. Using time-dependent matrix-product-states simulat
Externí odkaz:
http://arxiv.org/abs/1708.02832