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论文类型：期刊论文

发表时间：2009-05-01

发表刊物：EPL

收录刊物：SCIE、Scopus

卷号：86

期号：4

ISSN号：0295-5075

摘要：A general law is presented for (composite) quantum systems which directly describes the time evolution of quantum states (with one or both components) through an arbitrary noisy quantum channel. It is shown that the time evolution of all quantum states through a quantum channel can be completely captured by the evolution of a single "probe state". Thus, in order to grasp the information of the final output states subject to a quantum channel, especially an unknown one, only quantum state tomography of a single probe state is required, which dramatically simplifies the practical operations in experiment. Copyright (C) EPLA, 2009