<正> The entanglement capacity of general two-qubit unitary operators is studied when auxiliary systems areallowed,and the analytical results based on linear entropy when input states are disentangled are given....<正> The entanglement capacity of general two-qubit unitary operators is studied when auxiliary systems areallowed,and the analytical results based on linear entropy when input states are disentangled are given.From the resultsthe condition for perfect entangler,α_1=α_2=π/4,is obtained.Contrary to the case without auxiliary system,theparameter α_3 may play active role to the entanglement capacity when auxiliary systems are allowed.展开更多
基金The project supported by National Natural Science Foundation of China under Grant No. 60433050
文摘<正> The entanglement capacity of general two-qubit unitary operators is studied when auxiliary systems areallowed,and the analytical results based on linear entropy when input states are disentangled are given.From the resultsthe condition for perfect entangler,α_1=α_2=π/4,is obtained.Contrary to the case without auxiliary system,theparameter α_3 may play active role to the entanglement capacity when auxiliary systems are allowed.
