State tomography via weak measurements.

State tomography via weak measurements.
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通过弱测量进行状态断层扫描

DOI:
10.1038/srep01193
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发表时间:
2013
期刊:
影响因子:
4.6
通讯作者:
Wu, Shengjun
Wu, Shengjun
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Wu, Shengjun

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最近的工作表明,可以直接测量纯态的波函数,并且可以通过弱测量同时获得量子系统的互补知识。然而,原方案只适用于纯状态,由于大部分数据被后选择丢弃,因此效率不高。在这里,我们提出了纯态和混合态的弱测量层析成像方案,我们的方案是更有效的,因为我们不丢弃任何数据。此外,我们还证明了一般态的任何矩阵元都可以直接从适当的弱测量中读出。密度矩阵(及其所有元素)表示从一般测量中可直接访问的所有内容。
Recent work has revealed that the wave function of a pure state can be measured directly and that complementary knowledge of a quantum system can be obtained simultaneously by weak measurements. However, the original scheme applies only to pure states and it is not efficient because most of the data are discarded by post-selection. Here, we propose tomography schemes for pure states and for mixed states via weak measurements and our schemes are more efficient because we do not discard any data. Furthermore, we demonstrate that any matrix element of a general state can be directly read from an appropriate weak measurement. The density matrix (with all of its elements) represents all that is directly accessible from a general measurement.
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