Full expectation-value statistics for randomly sampled pure states in high-dimensional quantum systems.
Full expectation-value statistics for randomly sampled pure states in high-dimensional quantum systems.
复制标题
高维量子系统中随机采样纯态的完整期望值统计
DOI:
10.1103/physreve.99.012126
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
J. Gemmer
中科院分区:
文献类型:
--
作者:
P. Reimann;J. Gemmer
We explore how the expectation valuesof a largely arbitrary observableare distributed when normalized vectorsare randomly sampled from a high-dimensional Hilbert space. Our analytical results predict that the distribution exhibits a very narrow peak of approximately Gaussian shape, while the tails significantly deviate from a Gaussian behavior. In the important special case that the eigenvalues ofsatisfy Wigner's semicircle law, the expectation-value distribution for asymptotically large dimensions is explicitly obtained in terms of a large deviation function, which exhibits two symmetric nonanalyticities akin to critical points in thermodynamics.
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