Optimization of ultrafine entanglement witnesses
Quantum Physics
2018-03-30 v1
Abstract
The ultrafine entanglement witness, introduced in [F. Shahandeh, M. Ringbauer, J.C. Loredo, and T.C. Ralph, Phys. Rev. Lett. \textbf{118}, 110502 (2017)], can seamlessly and easily improve any standard entanglement witness. In this paper, by combining the constraint and the test operators, we rotate the hyperplane determined by the test operator and improve further the original ultrafine entanglement witness. In particular, we present a series of new ultrafine entanglement witnesses, which not only can detect entangled states that the original ultrafine entanglement witnesses cannot detect, but also have the merits that the original ultrafine entanglement witnesses have.
Keywords
Cite
@article{arxiv.1803.11065,
title = {Optimization of ultrafine entanglement witnesses},
author = {Shu-Qian Shen and Ti-Run Xu and Shao-Ming Fei and Xianqing Li-Jost and Ming Li},
journal= {arXiv preprint arXiv:1803.11065},
year = {2018}
}
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8 pages