X 型态两量子比特的量子谐错与共生纠缠度比照

摘要

The dynamic behaviours of quantum correlation measured by quantum discord are studied analytically and numerically for a two - qubit X states .The dynamics of entanglement with that of quantum discord are compared , and it is pointed out the difference between quantum discord and concurrence . It is concluded that quantum discord doesn't exhibit sudden death where concurrence can does . It is also indicated that quantum correlation in term of quantum discord is more robust than concurrence for discussed model .Moreover , it is also explained that quantum discord transfers between the subsystems AB and ab .%　　研究了一个 X 型态两量子比特由量子谐错测定的量子关联动力学特性的解析解和数值解，并与纠缠进行比照，指出了共生纠缠度与量子谐错间的差别，得到共生纠缠度出现纠缠突然死亡（ESD）处量子谐错不会。也指出了对于所研究的模型，用量子谐错量度量子关联比用共生纠缠度更具鲁棒性。进一步说明了量子谐错也反映了量子关联在系统 AB 和 ab 间的转移。