TY - JOUR

T1 - Entanglement Detection by Violations of Noisy Uncertainty Relations: A Proof of Principle

AU - Zhao, Yuan Yuan

AU - Xiang, Guo Yong

AU - Hu, Xiao Min

AU - Liu, Bi Heng

AU - Li, Chuan Feng

AU - Guo, Guang Can

AU - Schwonnek, René

AU - Wolf, Ramona

N1 - 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’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.

PY - 2019/6/7

Y1 - 2019/6/7

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85066922204&partnerID=8YFLogxK

U2 - 10.48550/arXiv.1810.05588

DO - 10.48550/arXiv.1810.05588

M3 - Article

C2 - 31283283

AN - SCOPUS:85066922204

VL - 122

JO - Physical review letters

JF - Physical review letters

SN - 0031-9007

IS - 22

M1 - 220401

ER -