Local channels preserving the states without measurement-induced nonlocality
Local channels preserving the states without measurement-induced nonlocality
复制标题
本地通道保留状态而没有测量引起的非局域性
DOI：
10.1088/1751-8113/46/32/325301
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发表时间：
2013-08-16
影响因子：
2.1
通讯作者：
Hou, Jinchuan
中科院分区：
文献类型：
--
作者：
Guo, Yu;Hou, Jinchuan
测度诱导非定域性是Luo和Fu最近提出的一种非定域性测度。我们在这里提出了这个量等于零的量子态的充分必要条件。进一步证明了对于dim H-a = d >= 3的状态rho（ab），作用于H-a的任何局域信道不能产生测量诱导非局域性当且仅当它是完全压缩信道或非平凡各向同性信道.对于量子比特的情况，这个性质是完全压缩通道或保持交换性的单位通道的附加特征。
Measurement-induced nonlocality is a measure of nonlocality introduced recently by Luo and Fu. We present here sufficient and necessary conditions for a quantum state for which this quantity is equal to zero. Furthermore it is shown that for such a state rho(ab) with dim H-a = d >= 3 any local channel acting on H-a cannot create measurement-induced nonlocality if and only if either it is a completely contractive channel or it is a nontrivial isotropic channel. For the qubit case this property is an additional characteristic of the completely contractive channel or the commutativity-preserving unital channel.