Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bibliometric analysis of topic structure in quantum computation and
  quantum algorithm research   We present a bibliometric analysis of the research papers on quantum
computation and quantum algorithms published in 1985-2020. We identify three
distinct periods from the trend of the annual number of published papers, and
show the 20 top contributing countries in each period in terms of the number of
publications and the number of total citations. The bibliographic coupling
network of the publications in the latest period is characterized as a dense,
small-world network with a small diameter, which contains 14 large communities,
whose topics are the fabrication of qubits in various physical systems, studies
of the quantum algorithms, and other related topics. Quantum machine learning,
one of the emerging topics in quantum computation, is found to be the
fifth-largest independent community.

28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol