Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Efficient approximation for global functions of matrix product operators   Building on a previously introduced block Lanczos method, we demonstrate how
to approximate any operator function of the form Trf (A) when the argument A is
given as a Hermitian matrix product operator. This gives access to quantities
that, depending on the full spectrum, are difficult to access for standard
tensor network techniques, such as the von Neumann entropy and the trace norm
of an MPO. We present a modified, more efficient strategy for computing thermal
properties of short- or long-range Hamiltonians, and illustrate the performance
of the method with numerical results for the thermal equilibrium states of the
Lipkin-Meshkov-Glick and Ising Hamiltonians.

0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int