2008/11/17 by Keisuke Fujii, Katsuji Yamamoto · 1 citation
Physics and Astronomy · #quant-ph
paper · pdf · doi:10.1103/physreva.80.042308
published as Phys. Rev. A 80 042308 (2009) · 10 pages, 10 figures
arxiv created 2008/11/17 · arxiv updated 2015/05/12
We investigate efficient entanglement purification through double selection process. This method works with higher noise thresholds for the communication channels and local operations, and achieves higher fidelity of purified states. Furthermore it provides a yield comparable to the usual protocol with single selection. It is shown by general considerations that the double selection is optimal to remove the first-order errors, achieving the upper bound on the fidelity of purified states in the low noise regime. The double selection is also applied to purification of multi-partite entanglement such as two-colorable graph states.