Overcoming Noise in Entanglement Distribution
Abstract
Noise can be considered the natural enemy of quantum information. An often implied benefit of high-dimensional entanglement is its increased resilience to noise. However, manifesting this potential in an experimentally meaningful fashion is challenging and has never been done before. In infinite dimensional spaces, discretisation is inevitable and renders the effective dimension of quantum states a tunable parameter. Owing to advances in experimental techniques and theoretical tools, we demonstrate an increased resistance to noise by identifying two pathways to exploit high-dimensional entangled states. Our study is based on two separate experiments utilising canonical spatio-temporal properties of entangled photon pairs. Following these different pathways to noise resilience, we are able to certify entanglement in the photonic orbital-angular-momentum and energy-time degrees of freedom up to noise conditions corresponding to a noise fraction of 72 % and 92 % respectively. Our work paves the way towards practical quantum communication systems that are able to surpass current noise and distance limitations, while not compromising on potential device-independence.
Cite
@article{arxiv.1904.01552,
title = {Overcoming Noise in Entanglement Distribution},
author = {Sebastian Ecker and Frédéric Bouchard and Lukas Bulla and Florian Brandt and Oskar Kohout and Fabian Steinlechner and Robert Fickler and Mehul Malik and Yelena Guryanova and Rupert Ursin and Marcus Huber},
journal= {arXiv preprint arXiv:1904.01552},
year = {2019}
}
Comments
12 pages main text, 7 pages supplementary information, 6 figures