Optimization of ultrafine entanglement witnesses
Shu-Qian Shen, Ti-Run Xu, Shao-Ming Fei, Xianqing Li-Jost, and Ming Li
Contact the author: Please use for correspondence this email.
Submission date: 06. Feb. 2018
published in: Physical review / A, 97 (2018) 3, art-no. 032343
DOI number (of the published article): 10.1103/PhysRevA.97.032343
Download full preprint: PDF (366 kB)
Recently, the ultrafine entanglement witness was introduced in [F. Shahandeh, M. Ringbauer, J.C. Loredo, and T.C. Ralph, Phys. Rev. Lett. 118, 110502 (2017)], which can seamlessly and easily improve any standard entanglement witness. In this paper, by the combining the constraint and the test operators, we rotate the hyperplane determined by the test operator and improve further the original ultrafine entanglement witness. We present a series of new ultrafine entanglement witnesses, which can detect entangled states that the original ultrafine entanglement witnesses cannot detect.