Qubit-environment entanglement outside of pure decoherence: hyperfine interaction
Quantum Physics
2023-03-15 v1 Mesoscale and Nanoscale Physics
Abstract
In spin-based architectures of quantum devices, the hyperfine interaction between the electron spin qubit and the nuclear spin environment remains one of the main sources of decoherence. This paper provides a short review of the current advances in the theoretical description of the qubit decoherence dynamics. Next, we study the qubit-environment entanglement using negativity as its measure. For an initial maximally mixed state of the environment, we study negativity dynamics as a function of environment size, changing the numbers of environmental nuclei and the total spin of the nuclei. Furthermore, we study the effect of the magnetic field on qubit-environment disentangling time scales.
Keywords
Cite
@article{arxiv.2210.10553,
title = {Qubit-environment entanglement outside of pure decoherence: hyperfine interaction},
author = {Tymoteusz Salamon and Marcin Płodzień and Maciej Lewenstein and Katarzyna Roszak},
journal= {arXiv preprint arXiv:2210.10553},
year = {2023}
}