Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Four-Qubits Code that is a Quantum Deletion Error-Correcting Code with
  the Optimal Length   This paper provides a new instance of quantum deletion error-correcting
codes. This code can correct any single quantum deletion error, while our code
is only of length 4. This paper also provides an example of an encoding quantum
circuit and decoding quantum circuits. It is also proven that the length of any
single deletion error-correcting codes is greater than or equal to 4. In other
words, our code is optimal for the code length.

27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con