Concurrence of Quantum States: Algebraic Dynamical Method Study XXX Models in a Time-Depending Random External Field
Chuan‐Ji Fu, Qinsheng Zhu, Wu Shao-Yi · Communications in Theoretical Physics · 2010
Based on algebraic dynamics and the concept of the concurrence of the entanglement, we investigate the evolutive properties of the two-qubit entanglement that formed by Heisenberg XXX models under a time-depending external held. For this system, the property of the concurrence that is only dependent on the coupling constant J and total values of the external field is proved. Furthermore, we found that the thermal concurrence of the system under a static random external field is a function of the coupling constant J , temperature T , and the magnitude of external held.