2 papers
quant-ph2012
Singularity of classical and quantum correlations at critical points of the Lipkin-Meshkov-Glick model in bipartition and tripartition of spins
Zhang Xiu-Xing, Li Fu-Li
We study the classical correlation (CC) and quantum discord (QD) between two spin subgroups of the Lipkin-Meshkov-Glick (LMG) model in both binary and trinary decompositions of spi…
quant-ph2012
Detecting multi-spin interaction of an XY spin chain by geometric phase of a coupled qubit
Zhang Xiu-Xing, Zhang Ai-Ping, Li Fu-Li
We investigate geometric phase (GP) of a qubit symmetrically coupled to a XY spin chain with three-spin interaction in a transverse magnetic field. An analytical expression for the…