We show that measurement can recover the quantum coherence of a qubit in a non-Markovian environment. The experimental demonstration in an optical system is provided by comparing the visibilities (and fidelities) of the final states with and without measurement. This method can be extended to other two-level quantum systems and entangled states in a non-Markovian evolution environment. It may also be used to implement other quantum information processing.
@article{arxiv.0810.5272,
title = {Measurement Induced Quantum Coherence Recovery},
author = {JinShi Xu and ChuanFeng Li and Ming Gong and XuBo Zou and Lei Chen and Geng Chen and JianShun Tang and GuangCan Guo},
journal= {arXiv preprint arXiv:0810.5272},
year = {2009}
}