Generalized Purity and Quantum Phase Transition for Bose-Einstein condensates in a Symmetric Double Well
arXiv:0812.4387 · doi:10.1103/PhysRevA.80.013610
Abstract
The generalized purity is employed for investigating the process of coherence loss and delocalization of the Q-function in the Bloch sphere of a two-mode Bose-Einstein condensate in a symmetrical double well with cross-collision. Quantum phase transition of the model is signaled by the generalized purity as a function of an appropriate parameter of the Hamiltonian and the number of particles (N). A power law dependence of the critical parameter with N is derived.
4 pages, 4 figures
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- Quantum Criticality in a Bosonic Josephson Junction
- Phase Transition, Entanglement and Squeezing in a Triple-Well Condensate
- Dynamical bifurcation as a semiclassical counterpart of a quantum phase transition
- The phase-separation mechanism of a binary mixture in a ring trimer
- Multiconfigurational quantum propagation with trajectory-guided generalized coherent states
- Coherent control of phase diffusion in a Bosonic Josephson junction by scattering length modulation