Europhys. Lett.
Volume 74, Number 5, June 2006
Page(s) 757 - 763
Section General
Published online 05 May 2006
Europhys. Lett., 74 (5), pp. 757-763 (2006)
DOI: 10.1209/epl/i2005-10587-x

Effects of entanglement on off-diagonal geometric phases

H. T. Cui, L. C. Wang and X. X. Yi

Department of Physics, Dalian University of Technology - Dalian 116024, PRC

received 13 July 2005; accepted in final form 10 April 2006
published online 5 May 2006

The effect of entanglement on off-diagonal geometric phases is investigated in the paper. Two spin-(1/2) particles in magnetic fields along the y direction are taken as an example. Three parameters (the purity of state r, the mixing angle $\theta$ and the relative phase $\beta$) are chosen to characterize the initial states. The nodal points at which the usual geometric phases disappear are calculated and illustrated as a function of the three parameters.

03.65.Vf - Phases: geometric; dynamic or topological.
03.65.Ud - Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.).

© EDP Sciences 2006