Generation of spin-dependent coherent states in a quantum wire
Abstract
We propose an all-electrically controlled nanodevice - a gated semiconductor nanowire - capable of generating a coherent state of a single electron trapped in a harmonic oscillator or superposition of such coherent states - the Schr\"odinger cat state. In the proposed scheme, electron in the ground state of the harmonic potential is driven by resonantly oscillating Rashba spin-orbit coupling. This allows for the creation of the Schr\"odinger cat state with superposition amplitudes depending on the initial electron spin state. Such a method can be used for initialization of a single spin qubit defined in a coherent state. The harmonic confinement potential along the InSb nanowire and the modulation of the Rashba spin-orbit coupling is obtained by proper gating. The results are supported by realistic three-dimensional time-dependent self consistent Poisson-Schr\"odinger calculations.
Keywords
Cite
@article{arxiv.1602.08531,
title = {Generation of spin-dependent coherent states in a quantum wire},
author = {J. Pawłowski and P. Szumniak and S. Bednarek},
journal= {arXiv preprint arXiv:1602.08531},
year = {2016}
}
Comments
6 pages, 4 figures