More Entanglement,Less Reliability
Entanglement of quantum states is a very important resource in quantum communication systems.For many special tasks,entanglement is found to be helpful.But it is still a problem how to nd the relationship between the amount of entangle-ment and the effect of doing the task.In this work,we consider a particular task —trying to send a single classical bit as effective as possible through a noisy quantum channel and two transmissions through the channel are available as a resource.For two special channels —amplitude damping channel and two-Pauli channel,we separately establish the quantitative connections,and try to nd whether the relationship is always monotonous,i.e.,the states with the larger entanglement necessarily result in the better effect.Unfortunately,this is not true.At the same time,we can get the optimal codes for the task using this method.
SONG Hong-Ting XI Zai-Rong
Key Laboratory of Systems and Control,Institute of Systems Science,Academy of Mathematics and System Graduate University of Chinese Academy of Sciences,Beijing 100039,P.R.China
国际会议
The 30th Chinese Control Conference(第三十届中国控制会议)
烟台
英文
1-4
2011-07-01（万方平台首次上网日期，不代表论文的发表时间）