2014/02/28 by Jibo Dai, Yink Loong Len, Yong Siah Teo +3
Computer Science · Mathematics · Neuroscience · Physics and Astronomy · #Computer science #Entanglement witness #Mathematical analysis #Mathematics #Multipartite entanglement #Neural dynamics and brain function #Photon #Photon entanglement #Physics #Polarization (electrochemistry) #Quantum #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum discord #Quantum entanglement #Quantum mechanics #Separable space #Separable state #Squashed entanglement #Statistical physics #Witness #quant-ph
paper · pdf · doi:10.1103/physrevlett.113.170402
published as Phys. Rev. Lett. 113, 170402 (2014) · Accepted for PRL. V3 includes an appendix which we comment on related work, discuss more general adaptive schemes, provide some technical details of the experiment. We thank the anonymous referees for critical suggestions and comments
arxiv created 2014/09/28 · openalex publication_date 2014/10/21 · arxiv updated 2014/10/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We report an experiment in which one determines, with least tomographic effort, whether an unknown two-photon polarization state is entangled or separable. The method measures whole families of optimal entanglement witnesses. We introduce adaptive measurement schemes that greatly speed up the entanglement detection. The experiments are performed on states of different ranks, and we find good agreement with results from computer simulations.