Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum State Transfer in a Two-dimensional Regular Spin Lattice of
  Triangular Shape   Quantum state transfer in a triangular domain of a two-dimensional,
equally-spaced, spin lat- tice with non-homogeneous nearest-neighbor couplings
is analyzed. An exact solution of the one- excitation dynamics is provided in
terms of 2-variable Krawtchouk orthogonal polynomials that have been recently
defined. The probability amplitude for an excitation to transit from one site
to another is given. For some values of the parameters, perfect transfer is
shown to take place from the apex of the lattice to the boundary hypotenuse.

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The categories of this paper are: hep-ph
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The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
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The categories of this paper are: nlin
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph