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论文类型：期刊论文

发表时间：2014-02-01

发表刊物：INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS

收录刊物：SCIE、Scopus

卷号：53

期号：2

页面范围：715-726

ISSN号：0020-7748

关键字：Quantum channel; Decoherence; Fidelity

摘要：When a quantum state undergoes a quantum channel, the state will be inevitably influenced. In general, the fidelity of the state is reduced, so is the entanglement if the subsystems go through the channel. However, the influence on the coherence of the state is quite different. Here we present some state-independent quantities to describe to what degree the fidelity, the entanglement and the coherence of the state are influenced. As applications, we consider some quantum channels on a qubit and find that the infidelity ability monotonically depends on the decay rate, but in usual the decoherence ability is not the case and strongly depends on the channel.