We report the observation of phase-super resolution in a motion-sensitive spin-wave (SW) atom interferometer utilizing a NOON-type entanged state. The SW interferometer is implemented by generating a superposition of two SWs and observing the interference between them, where the interference fringe is sensitive to the atomic collective motion. By heralded generation of a second order NOON state in the SW interferometer, we clearly observe the interference pattern with phase super-resolution. The demonstrated SW interferometer can in principle be scaled up to highly entangled quantum state, and thus is of fundamental importance to implement quantum-enhanced-measurement.
@article{arxiv.0904.3617,
title = {Entanglement assisted spin-wave atom interferometer},
author = {Yu-Ao Chen and Xiao-Hui Bao and Zhen-Sheng Yuan and Shuai Chen and Bo Zhao and Jian-Wei Pan},
journal= {arXiv preprint arXiv:0904.3617},
year = {2010}
}