Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Matrix product state approach for a quantum system at finite
  temperatures using random phases and Trotter gates   We develop a numerical method based on matrix product states for simulating
quantum many-body systems at finite temperatures without importance sampling
and evaluate its performance in spin 1/2 systems. Our method is an extension of
the random phase product state (RPPS) approach introduced recently [T. Iitaka,
arXiv:2006.14459]. We show that the original RPPS approach often gives
unphysical values for thermodynamic quantities even in the Heisenberg chain. We
find that by adding the operation of Trotter gates to the RPPS, the sampling
efficiency of the approach significantly increases and its results are
consistent with those of the purification approach. We also apply our method to
a frustrated spin 1/2 system to exemplify that it can simulate a system in
which the purification approach fails.

35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat