Coherent transfer of electron spin correlations assisted by dephasing noise
Abstract
Quantum coherence of superposed states, especially of entangled states, is indispensable for many quantum technologies. However, it is vulnerable to environmental noises, posing a fundamental challenge in solid-state systems including spin qubits. Here we show a scheme of entanglement engineering where pure dephasing assists the generation of quantum entanglement at distant sites in a chain of electron spins confined in semiconductor quantum dots. One party of an entangled spin pair, prepared at a single site, is transferred to the next site and then adiabatically swapped with a third spin using a transition across a multi-level avoided crossing. This process is accelerated by the noise-induced dephasing through a variant of the quantum Zeno effect, without sacrificing the coherence of the entangled state. Our finding brings insight into the spin dynamics in open quantum systems coupled to noisy environments, opening an avenue to quantum state manipulation utilizing decoherence effects.
Keywords
Cite
@article{arxiv.1604.02232,
title = {Coherent transfer of electron spin correlations assisted by dephasing noise},
author = {Takashi Nakajima and Matthieu R. Delbecq and Tomohiro Otsuka and Shinichi Amaha and Jun Yoneda and Akito Noiri and Kenta Takeda and Giles Allison and Arne Ludwig and Andreas D. Wieck and Xuedong Hu and Franco Nori and Seigo Tarucha},
journal= {arXiv preprint arXiv:1604.02232},
year = {2018}
}
Comments
33 pages, 5 figures