摘要
研究了在相反方向的外磁场中两个量子比特的热纠缠,计算了这个体系的密度矩阵,通过密度矩阵得到了三个不同温度下热纠缠度—并协度.发现在相反磁场中,比特间的热纠缠度及转变温度将被提高.
The thermal entanglement between two qubits in an opposite external magnetic field is investigated in this paper. It gets the density matrix of this system first. Then, concurrence, the measurement of entanglement is present at three different temperatures. It finds that the entanglement between two qubits and the critical temperature will be enhanced in an opposite magnetic field.
出处
《河南大学学报（自然科学版）》
CAS
北大核心
2007年第5期465-467,共3页
Journal of Henan University:Natural Science
关键词
量子比特
热纠缠
并协度
qubit
thermal entanglement
concurrence
