Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum Cheshire Cats   In this paper we present a quantum Cheshire Cat. In a pre- and post-selected
experiment we find the Cat in one place, and its grin in another. The Cat is a
photon, while the grin is its circular polarization.

9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg