Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measuring Renyi Entanglement Entropy with Quantum Monte Carlo   We develop a quantum Monte Carlo procedure, in the valence bond basis, to
measure the Renyi entanglement entropy of a many-body ground state as the
expectation value of a unitary {\it Swap} operator acting on two copies of the
system. An improved estimator involving the ratio of {\it Swap} operators for
different subregions enables simulations to converge the entropy in a time
polynomial in the system size. We demonstrate convergence of the Renyi entropy
to exact results for a Heisenberg chain. Finally, we calculate the scaling of
the Renyi entropy in the two-dimensional Heisenberg model and confirm that the
N\'eel groundstate obeys the expected area law for systems up to linear size
L=28.

22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an