Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: QTM: computational package using MPI protocol for quantum trajectories
  method   The Quantum Trajectories Method (QTM) is one of {the} frequently used methods
for studying open quantum systems. { The main idea of this method is {the}
evolution of wave functions which {describe the system (as functions of time).
Then,} so-called quantum jumps are applied at {a} randomly selected point in
time. {The} obtained system state is called as a trajectory. After averaging
many single trajectories{,} we obtain the approximation of the behavior of {a}
quantum system.} {This fact also allows} us to use parallel computation
methods. In the article{,} we discuss the QTM package which is supported by the
MPI technology. Using MPI allowed {utilizing} the parallel computing for
calculating the trajectories and averaging them -- as the effect of these
actions{,} the time {taken by} calculations is shorter. In spite of using the
C++ programming language, the presented solution is easy to utilize and does
not need any advanced programming techniques. At the same time{,} it offers a
higher performance than other packages realizing the QTM. It is especially
important in the case of harder computational tasks{,} and the use of MPI
allows {improving the} performance of particular problems which can be solved
in the field of open quantum systems.

34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
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The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga