Parameter regimes for surpassing the PLOB bound with error-corrected qudit repeaters
Abstract
A potential quantum internet would open up the possibility of realizing numerous new applications, including provably secure communication. Since losses of photons limit long-distance, direct quantum communication and widespread quantum networks, quantum repeaters are needed. The so-called PLOB-repeaterless bound [Pirandola et al., Nat. Commun. 8, 15043 (2017)] is a fundamental limit on the quantum capacity of direct quantum communication. Here, we analytically derive the quantum-repeater gain for error-corrected, one-way quantum repeaters based on higher-dimensional qudits for two different physical encodings: Fock and multimode qudits. We identify parameter regimes in which such quantum repeaters can surpass the PLOB-repeaterless bound and systematically analyze how typical parameters manifest themselves in the quantum-repeater gain. This benchmarking provides a guideline for the implementation of error-corrected qudit repeaters.
Cite
@article{arxiv.1906.05172,
title = {Parameter regimes for surpassing the PLOB bound with error-corrected qudit repeaters},
author = {Daniel Miller and Timo Holz and Hermann Kampermann and Dagmar Bruß},
journal= {arXiv preprint arXiv:1906.05172},
year = {2019}
}
Comments
23 pages, 6 figures, minor changes, accepted for publication in Quantum