Efficient multipartite entanglement purification with the entanglement link from a subspace
Abstract
We present an efficient multipartite entanglement purification protocol (MEPP) for N-photon systems in a Greenberger-Horne-Zeilinger state with parity-check detectors. It contains two parts. One is the conventional MEPP with which the parties can obtain a high-fidelity N-photon ensemble directly, similar to the MEPP with controlled-not gates. The other is our recycling MEPP in which the entanglement link is used to produce some -photon entangled systems from entangled N'-photon subsystems (2 \leq N'<N) coming from the instances which are just discarded in all existing conventional MEPPs. The entangled N'-photon subsystems are obtained efficiently by measuring the photons with potential bit-flip errors. With these two parts, the present MEPP has a higher efficiency than all other conventional MEPPs.
Keywords
Cite
@article{arxiv.1110.0059,
title = {Efficient multipartite entanglement purification with the entanglement link from a subspace},
author = {Fu-Guo Deng},
journal= {arXiv preprint arXiv:1110.0059},
year = {2015}
}
Comments
17 pages, 9 figures, 2 tables. We correct the error in the address of the author in the published version (Phys. Rev. A 84, 052312 (2011))