Branche d’excitation collective du continuum dans les gaz de fermions condensés par paires : étude analytique et lois d’échelle

Autor: Hadrien Kurkjian, Yvan Castin

Publikováno v: Comptes Rendus. Physique. 21:253-310

Les gaz de fermions de spin 1/2 non polarises condenses par paires presentent une branche d'excitation collective dans leur continuum de paire brisee (V.A. Andrianov, V.N. Popov, 1976). Nous en effectuons une etude poussee a temperature nulle, a part

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c710056dd5462d3e013446855c778ee9
https://doi.org/10.5802/crphys.1

Nuclear spin squeezing by continuous quantum non-demolition measurement: a theoretical study

Autor: Alan Serafin, Philipp Treutlein, Matteo Fadel, Yvan Castin, Alice Sinatra

Publikováno v: Comptes Rendus. Physique
Comptes Rendus. Physique, Académie des sciences (Paris), 2021, 22, pp.1-35. ⟨10.5802/crphys.71⟩

in English (25 pages) and in French (26 pages); We propose to take advantage of the weak coupling of ground-helium 3 nuclear spin to its environment to produce long-lived macroscopic quantum states, nuclear spin squeezed states, in a vapor cell at ro

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9eb434f68fb3d1f7668d44e378f0cbf3

Coherence time of a Bose-Einstein condensate in an isolated harmonically trapped gas

Autor: Yvan Castin, Alice Sinatra

Publikováno v: Comptes Rendus. Physique
Comptes Rendus. Physique, Académie des sciences (Paris), 2018, 19, pp.316. ⟨10.1016/j.crhy.2018.04.001⟩

published version in English (22 pages) and in French (23 pages); International audience; We study the condensate phase dynamics in a low-temperature equilibrium gas of weakly interacting bosons, harmonically trapped and isolated from the environment

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3375247726674d7ba85993ec31fa4873
https://hal.archives-ouvertes.fr/hal-01726498v2/file/francais.pdf

Landau Phonon-Roton Theory Revisited for Superfluid He4 and Fermi Gases

Autor: Hadrien Kurkjian, Alice Sinatra, Yvan Castin

Publikováno v: Physical Review Letters. 119

Liquid helium and spin-1/2 cold-atom Fermi gases both exhibit in their superfluid phase two distinct types of excitations, gapless phonons and gapped rotons or fermionic pair-breaking excitations. In the long wavelength limit, revising and extending

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c4f26289497427f1d2e685fee8308320
https://doi.org/10.1103/physrevlett.119.260402

Superpositions quantiques mésoscopiques dans des condensats de Bose-Einstein bimodaux : décohérence et contre-mesures

Autor: Philipp Treutlein, Krzysztof Pawłowski, Alice Sinatra, Yvan Castin, Matteo Fadel

Publikováno v: Physical Review A
Physical Review A, 2017, 95, pp.063609. ⟨10.1103/PhysRevA.95.063609⟩
Physical Review A, American Physical Society 2017, 95, pp.063609. ⟨10.1103/PhysRevA.95.063609⟩

We study theoretically the interaction-induced generation of mesoscopic coherent spin state superpositions (small cat states) from an initial coherent spin state in bimodal Bose-Einstein condensates and the subsequent phase revival, including decoher

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::be7ec31be163bac4a58fd761768a1a9d
http://arxiv.org/abs/1703.07291