2012/07/31 by Denis Gonta, Denis Gonţa, Peter van Loock · 2 citations
Computer Science · Engineering · Physics and Astronomy · #Bipartite graph #Computer science #Electrical engineering #Encoding (memory) #Engineering #Fidelity #Physics #Quantum #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum entanglement #Quantum mechanics #Quantum optics and atomic interactions #Repeater (horology) #Telecommunications #Theoretical computer science #Topology (electrical circuits) #quant-ph
paper · pdf · doi:10.1103/physreva.86.052312
published as Phys. Rev. A 86, 052312 (2012) · 13 pages, 4 figures, revised version accepted in PRA. arXiv admin note: text overlap with arXiv:1106.3537
arxiv created 2012/10/26 · openalex publication_date 2012/11/09 · arxiv updated 2013/05/29 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
In our previous paper [D. Gon\ifmmode \mbox\ct\else \ct\fia and P. van Loock, Phys. Rev. A 84, 042303 (2011)], we proposed an efficient scheme to purify dynamically a bipartite entangled state using short chains of atoms coupled to high-finesse optical cavities. In contrast to conventional entanglement purification protocols, we avoid controlled-not gates and thus reduce complicated pulse sequences and superfluous qubit operations. In this paper, we significantly improve the output fidelity of remotely entangled atoms by introducing one additional entanglement protocol in each of the repeater nodes and by optimizing the laser beams required to control the entire scheme. Our improved distillation scheme yields an almost-unit output fidelity that, together with the entanglement distribution and swapping, opens an attractive route towards an efficient and experimentally feasible quantum repeater for long-distance quantum communication.