Macroscopic inequivalent entanglement witness in Heisenberg spin chain  

作　　者：张婷 陈平形 李承祖 

机构地区：[1]Department of Physics, Science College, National University of Defence Technology

出　　处：《Chinese Physics B》2009年第4期1346-1351,共6页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant No 10404039);the Foundation for the Author of National Excellent Doctoral Dissertation of China (Grant No 200524);Program for New Century Excellent Talents (NCET) of China (Grant No NCET-06-0920)

摘　　要：Motivated by the wise idea of entanglement witness （EW）, we present an inequivalent entanglement witness （IEEW） that can analogously classify certain eigenstates entangled in inequivalent ways under stochastic local operations and classical communication （SLOCC） in the Heisenberg spin chain. Since the IEEW is the absolute value of magnetization （M） that is a macroscopically measurable quantity, our conclusions provide a macroscopic method to detect inequivalent entanglement between microscopic spins, on the one hand, and clearly show that inequivalent entanglement can yield different macroscopic effects, on the other hand.Motivated by the wise idea of entanglement witness （EW）, we present an inequivalent entanglement witness （IEEW） that can analogously classify certain eigenstates entangled in inequivalent ways under stochastic local operations and classical communication （SLOCC） in the Heisenberg spin chain. Since the IEEW is the absolute value of magnetization （M） that is a macroscopically measurable quantity, our conclusions provide a macroscopic method to detect inequivalent entanglement between microscopic spins, on the one hand, and clearly show that inequivalent entanglement can yield different macroscopic effects, on the other hand.

关 键 词：Heisenberg spin chain inequivalent entanglement witness 

分 类 号：O413.1[理学—理论物理]