aqora

Spatial Dependence of Entropy in Trapped Ultracold Bose Gases

Lincoln D. Carr, Markus K. Oberthaler

We find a new physical regime in the trapped Bose-Hubbard Hamiltonian using time-evolving block decimation. Between Mott-insulating and superfluid phases, the latter induced by trap compression, a spatially self-organized state appears in which non-local entropy signals entanglement between spatially distant superfluid shells. We suggest a linear rather than harmonic potential as an ideal way to observe such a self-organized system. We also explore both quantum information and thermal entropies in the superfluid regime, finding that while the former follows the density closely the latter can be strongly manipulated with the mean field.We find a new physical regime in the trapped Bose-Hubbard Hamiltonian using time-evolving block decimation. Between Mott-insulating and superfluid phases, the latter induced by trap compression, a spatially self-organized state appears in which non-local entropy signals entanglement between spatially distant superfluid shells. We suggest a linear rather than harmonic potential as an ideal way to observe such a self-organized system. We also explore both quantum information and thermal entropies in the superfluid regime, finding that while the former follows the density closely the latter can be strongly manipulated with the mean field.

arXiv:0906.4708APSJun 25, 20092 citations

QUANTUM INFORMATION WITH SINGLE ULTRACOLD ATOMS IN OPTICAL TRAPS

Optoelectronics Instrumentation and Data ProcessingJan 1, 20200 citations

Box traps on an atom chip for one-dimensional quantum gases

J J P van Es, P Wicke, Aaldert H. van Amerongen +3 more

We present the implementation of tailored trapping potentials for ultracold gases on an atom chip. We realize highly elongated traps with box-like confinement along the long, axial direction combined with conventional harmonic confinement along the two radial directions. The design, fabrication and characterization of the atom chip and the box traps are described. We load ultracold (≲ 1 µK) clouds of 87 Rb in a box trap, and demonstrate Bose-gas focusing as a means to characterize these atomic clouds in arbitrarily shaped potentials. Our results show that box-like axial potentials on atom chips are very promising for studies of one-dimensional quantum gases.We present the implementation of tailored trapping potentials for ultracold gases on an atom chip. We realize highly elongated traps with box-like confinement along the long, axial direction combined with conventional harmonic confinement along the two radial directions. The design, fabrication and characterization of the atom chip and the box traps are described. We load ultracold (≲ 1 µK) clouds of 87 Rb in a box trap, and demonstrate Bose-gas focusing as a means to characterize these atomic clouds in arbitrarily shaped potentials. Our results show that box-like axial potentials on atom chips are very promising for studies of one-dimensional quantum gases.

arXiv:0911.5250Journal of Physics B Atomic Molecular and Optical PhysicsJul 7, 201055 citations

Thermodynamics in an ultracold mixture of optically trapped atomic gases

Marcel Carto Constantin Mudrich, Kilian Singer, Allard P. Mosk +1 more

Jan 1, 20030 citations

The Zel’dovich effect in harmonically trapped, ultracold quantum gases

Aaron Farrell, Zachary MacDonald, Brandon P. van Zyl

We investigate the Zel'dovich effect in the context of ultracold, harmonically trapped quantum gases. We suggest that currently available experimental techniques in cold-atom research offer an exciting opportunity for a direct observation of the Zel'dovich effect without the difficulties imposed by conventional condensed matter and nuclear physics studies. We also demonstrate an interesting scaling symmetry in the level rearrangements which has heretofore gone unnoticed.

arXiv:1107.2334Journal of Physics A Mathematical and TheoreticalJan 4, 20127 citations

An Experimental Extraction of Entanglement Entropy in an Ultracold Atomic Gas

Craig Price, Qi Liu, Nathan Gemelke

Bulletin of the American Physical SocietyMar 3, 20140 citations

Quantum information entropies of ultracold atomic gases in a harmonic trap

Related papers

Quantum information entropies of ultracold atomic gases in a harmonic trap

Related papers