Abstract
In this paper, we investigate decoherence caused by a system of polaron in asymmetric quantum wire (AQW) using an all coupling variational method. We have derived the ground and first excited energy states, which describe the two states of polaron in an AQW. The two quantum states formed by the polaron in quantum wire can form a quantum bit due to the formation of superposition states. Spontaneous emission of phonon is observed and the induced decoherence is studied via decoherence time and entropy. It is found that the system of AQW nanostructure can be used for the realization of a qubit, which necessitates a very small decoherence time. Our results show that the polaron dynamics is very sensitive to the asymmetry of the wire if the confinement is reduced below a certain length scale.
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