A general quantum channel consisting of a decohering and a filtering element carries one qubit of an entangled photon pair. As we apply a local filter to the other qubit, some mutual quantum information between the two qubits is restored depending on the properties of the noise mixed into the signal. We demonstrate a drastic difference between channels with bit-flip and phase-flip noise and further suggest a scheme for maximal recovery of the quantum information.
@article{arxiv.2007.12610,
title = {Exploring classical correlations in noise to recover quantum information using local filtering},
author = {Daniel E. Jones and Brian T. Kirby and Gabriele Riccardi and Cristian Antonelli and Michael Brodsky},
journal= {arXiv preprint arXiv:2007.12610},
year = {2020}
}