科研之友
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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.
- 出版日期2009-5
- 单位大连理工大学
