Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum macroscopicity measure for arbitrary spin systems and its
  application to quantum phase transitions   We explore a previously unknown connection between two important problems in
physics, i.e., quantum macroscopicity and the quantum phase transition. We
devise a general and computable measure of quantum macroscopicity that can be
applied to arbitrary spin states. We find that a macroscopic quantum
superposition of an extremely large size arises during the quantum phase
transition of the transverse Ising model in contrast to some seeming
macroscopic quantum phenomena such as superconductivity, superfluidity and
Bose-Einstein condensates. Our result may be an important step forward in
understanding macroscopic quantum properties of many-body systems.

11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys