We propose and demonstrate experimentally a scheme to create entangled history states of the Greenberger-Horne-Zeilinger (GHZ) type. In our experiment, the polarization states of a single photon at three different times are prepared as a GHZ entangled history state. We define a GHZ functional which attains a maximum value 1 on the ideal GHZ entangled history state and is bounded above by 1/16 for any three-time history state lacking tripartite entanglement. We have measured the GHZ functional on a state we have prepared experimentally, yielding a value of 0.656±0.005, clearly demonstrating the contribution of entangled histories.
Cite
@article{arxiv.1601.02943,
title = {Experimental Test of Entangled Histories},
author = {Jordan Cotler and Lu-Ming Duan and Pan-Yu Hou and Frank Wilczek and Da Xu and Zhang-Qi Yin and Chong Zu},
journal= {arXiv preprint arXiv:1601.02943},
year = {2017}
}
Comments
15 pages, 2 figures v. 2: 16 pages, 2 figures. Fundamental improvements to introduction, added references