Variational estimation of entanglement entropy for bipartite many-body systems
Variational estimation of entanglement entropy for bipartite many-body systems
复制标题
二分多体系统纠缠熵的变分估计
DOI:
10.1088/1742-5468/ab4bc0
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
Takaaki Monnai
中科院分区:
文献类型:
--
作者:
Nakazawa Shigeaki;Kanno Tomomi;Sugisaki Kenji;Kameya Hiromi;Matsui Miki;Ukai Mitsuko;Sato Kazunobu;Takui Takeji;Takaaki Monnai
We explore a variational characterization of the bipartite entanglement entropy such as von Neumann entropy for pure states in terms of general projective measurements of an arbitrary system. By properly choosing the measurement basis, we show that a general estimation of the bipartite entanglement measure can be explicitly written. The number of projective measurement operators of the subsystem necessary for calculating an upper bound of the bipartite entanglement entropy is less than or equal to the dimension of the smaller subsystem. This number is much smaller than that of the full tomography of the density matrix. As an application, our method is useful to estimate the entanglement entropy of each energy eigenstate of a given Hamiltonian.
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