Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Entanglement Control of Azobenzene by Photoisomerization in NMR Quantum
  Computer   Entanglement control of qubits in a photoisomerizing molecule is studied in
the context of an NMR quantum computer by taking azobenzene as an example.
Azobenzene has two different isomers, {\it{}trans}-azobenzene (TAB) and
{\it{}cis}-azobenzene (CAB), which can be interconverted by photoisomerization.
Changing molecular structure leads to change in the spin-spin coupling
constant, and hence leads to change in entangling operation time. We first
obtain stable structures of TAB and CAB by {\it ab initio} calculation. Then,
we calculate the NMR spectra of these isomers and verify that they reproduce
the chemical shift obtained experimentally with a good precision. Our result
indicates that the coupling strength between a $^{15}$N and a $^{13}$C nuclei
in the molecule changes by a large amount under photoisomerization.

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The categories of this paper are: nucl-ex
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The categories of this paper are: math
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The categories of this paper are: stat
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The categories of this paper are: adap-org
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The categories of this paper are: hep-ph
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-th
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The categories of this paper are: alg-geom
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The categories of this paper are: funct-an
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The categories of this paper are: comp-gas
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The categories of this paper are: physics
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The categories of this paper are: cmp-lg
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The categories of this paper are: cond-mat
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The categories of this paper are: gr-qc
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The categories of this paper are: solv-int
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The categories of this paper are: math-ph