Entanglement Detection by Violations of Noisy Uncertainty Relations: A Proof of Principle

authored by: Yuan Yuan Zhao, Guo Yong Xiang, Xiao Min Hu, Bi Heng Liu, Chuan Feng Li, Guang Can Guo, René Schwonnek, Ramona Wolf
Abstract: It is well known that the violation of a local uncertainty relation can be used as an indicator for the presence of entanglement. Unfortunately, the practical use of these nonlinear witnesses has been limited to few special cases in the past. However, new methods for computing uncertainty bounds have become available. Here we report on an experimental implementation of uncertainty-based entanglement witnesses, benchmarked in a regime dominated by strong local noise. We combine the new computational method with a local noise tomography in order to design noise-adapted entanglement witnesses. This proof-of-principle experiment shows that quantum noise can be successfully handled by a fully quantum model in order to enhance the ability to detect entanglement.
Organisation(s): Institute of Theoretical Physics
QuantumFrontiers
External Organisation(s): University of Science and Technology of China
Sun Yat-Sen University
National University of Singapore
Type: Article
Journal: Physical review letters
Volume: 122
ISSN: 0031-9007
Publication date: 07.06.2019
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Physics and Astronomy(all)
Electronic version(s): https://doi.org/10.48550/arXiv.1810.05588 (Access: Open)
https://doi.org/10.1103/PhysRevLett.122.220401 (Access: Closed)

BibTeX

@article{b157c144ba3842e388e240f3769e16a0,
title = "Entanglement Detection by Violations of Noisy Uncertainty Relations: A Proof of Principle",
abstract = "It is well known that the violation of a local uncertainty relation can be used as an indicator for the presence of entanglement. Unfortunately, the practical use of these nonlinear witnesses has been limited to few special cases in the past. However, new methods for computing uncertainty bounds have become available. Here we report on an experimental implementation of uncertainty-based entanglement witnesses, benchmarked in a regime dominated by strong local noise. We combine the new computational method with a local noise tomography in order to design noise-adapted entanglement witnesses. This proof-of-principle experiment shows that quantum noise can be successfully handled by a fully quantum model in order to enhance the ability to detect entanglement.",
author = "Zhao, {Yuan Yuan} and Xiang, {Guo Yong} and Hu, {Xiao Min} and Liu, {Bi Heng} and Li, {Chuan Feng} and Guo, {Guang Can} and Ren{\'e} Schwonnek and Ramona Wolf",
note = "Funding information: R. S. and R. W. thank Reinhard F. Werner, Tobias J. Osborne, and Deniz E. Stiegemann for fruitful discussions and critically reading of our Letter. Y. Y. Z. thanks Yu Guo{\textquoteright}s help in the experiment. R. S. and R. W. also acknowledge the financial support given by the RTG 1991, the CRC 1227 DQ-mat, and the cluster of excellence EXC 2123 QuantumFrontiers funded by the DFG, the collaborative research projects Q.com-Q and Q.Link.X funded by the BMBF and the Asian Office of Aerospace RD Grant No. FA2386-18-1-4033. The work at USTC is supported by the National Natural Science Foundation of China (Grants No. 11574291, No. 11774334, No. 61327901, No. 11874345, and No. 11774335), the National Natural Science Foundation for the Youth of China (Grant No. 11804410), the China Postdoctoral Science Foundation (Grant No. 2017M620260), the National Key Research and Development Program of China (Grant No. 2017YFA0304100), and the Key Research Program of Frontier Sciences, CAS (Grant No. QYZDY-SSW-SLH003), Anhui Initiative in Quantum Information Technologies.",
year = "2019",
month = jun,
day = "7",
doi = "10.48550/arXiv.1810.05588",
language = "English",
volume = "122",
journal = "Physical review letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "22",
}