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The ground states of phonons in dissipative quantum tunneling system and their influences on the localization delocalization transition are investigated by a variational approach. We find that: 1.There are two kind of influences, displacement and deformation, on phonon describe both these influences. 2. The localization-delocalization transition depends on the choice of phonon ground state. The transition will occur at strong coupling as the energy of the ground state decreases.
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