We combine the eyebrow-raising quantum phenomena of erasure and counterfactuality for the first time, proposing a simple yet unusual quantum eraser: A distant Bob can decide to erase which-path information from Alice's photon, dramatically restoring interference, without previously-shared entanglement, and without Alice's photon ever leaving her lab.
Cite
@article{arxiv.1606.03081,
title = {Counterfactual quantum erasure: spooky action without entanglement},
author = {Hatim Salih},
journal= {arXiv preprint arXiv:1606.03081},
year = {2018}
}