Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Generalized Bell inequality for mixed states with variable constraints   In this paper, we present a generalized Bell inequality for mixed states. The
distinct characteristic is that the inequality has variable bound depending on
the decomposition of the density matrix. The inequality has been shown to be
more refined than the previous Bell inequality. It is possible that a separable
mixed state can violate the Bell inequality.

28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat