Geometric spin echo under zero field
Abstract
Spin echo is a fundamental tool for quantum registers and biomedical imaging. It is believed that a strong magnetic field is needed for the spin echo to provide long memory and high resolution since a degenerate spin cannot be controlled or addressed under a zero magnetic field. While a degenerate spin is never subject to dynamic control, it is still subject to geometric control. Here we show the spin echo of a degenerate spin subsystem, which is geometrically controlled via a mediating state split by the crystal field, in a nitrogen vacancy center in diamond. The demonstration reveals that the degenerate spin is protected by inherent symmetry breaking called zero-field splitting. The geometric spin echo under zero field provides an ideal way to maintain the coherence without any dynamics, thus opening the way to pseudo-static quantum random access memory and non-invasive biosensors.
Cite
@article{arxiv.1603.00144,
title = {Geometric spin echo under zero field},
author = {Yuhei Sekiguchi and Yusuke Komura and Shota Mishima and Touta Tanaka and Naeko Niikura and Hideo Kosaka},
journal= {arXiv preprint arXiv:1603.00144},
year = {2016}
}