Macroscopic Quantum Coherence in a repulsive Bose-Einstein condensate

Abstract

We consider a Bose-Einstein bicondensate (BEC) of ${}^{87}Rb$, trapped in two different internal levels, in a situation where the density undergoes a symmetry breaking in momentum space. This occurs for a suitable number of condensed atoms within a double well dispersion curve, obtained by Raman coupling two internal states with two tilted and detuned light fields. Evidence of bistability results from the Gross-Pitaevskii equation. By second quantization, we evaluate the tunneling rate between the two asymmetric states; the effects of losses on coherence are also considered.

4 pages, 4 figures

References in corpus (3)

• Quantum phase transition from a superfluid to a Mott insulator in a gas of ultracold atoms
• All Optical Formation of an Atomic Bose-Einstein Condensate
• Bistability and macroscopic quantum coherence in a BEC of ^7Li

Cited by in corpus (4)

• Light-induced gauge fields for ultracold atoms
• Raman processes and effective gauge potentials
• Quantum phase space picture of Bose-Einstein Condensates in a double well: Proposals for creating macroscopic quantum superposition states and a study of quantum chaos
• Generating Schrödinger-cat states in momentum and internal-state space from Bose-Einstein condensates with repulsive interactions