Estimating the concurrence for quantum states via symmetric measurements

Hao-Fan Wang; Wen Zhou; Lin Chen; Li Xu; Shao-Ming Fei

Estimating the concurrence for quantum states via symmetric measurements

Quantum Physics 2026-06-30 v1

Authors: Hao-Fan Wang , Wen Zhou , Lin Chen , Li Xu , Shao-Ming Fei

Abstract

We derive improved lower bounds of concurrence induced by symmetric measurements, which retains experimental feasibility without state tomography. More importantly, we resolve a related inequality conjecture, which implies that numerous previous results based on symmetric measurements are strictly stronger than the one based on realignment. In addition, we also present a lower bound of genuine tripartite entanglement concurrence based on symmetric measurements.

Keywords

concurrence symmetric measurements entanglement lower bounds quantum state

Cite

@article{arxiv.2606.31010,
  title  = {Estimating the concurrence for quantum states via symmetric measurements},
  author = {Hao-Fan Wang and Wen Zhou and Lin Chen and Li Xu and Shao-Ming Fei},
  journal= {arXiv preprint arXiv:2606.31010},
  year   = {2026}
}