Entanglement Control of Azobenzene by Photoisomerization in NMR Quantum Computer
Abstract
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, trans-azobenzene (TAB) and 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 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 15N and a 13C nuclei in the molecule changes by a large amount under photoisomerization.
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