Photonic realization of erasure-based nonlocal measurements

Wei Wei Pan, Xiao Ye Xu, Eliahu Cohen, Qin Qin Wang, Zhe Chen, Munsif Jan, Yong Jian Han, Chuan Feng Li, Guang Can Guo

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Relativity theory severely restricts the ability to perform nonlocal measurements in quantum mechanics. Studying such nonlocal schemes may thus reveal insights regarding the relations between these two fundamental theories. Therefore, for the last several decades, nonlocal measurements have stimulated considerable interest. However, the experimental implementation of nonlocal measurements imposes profound restrictions because the interaction Hamiltonian cannot contain, in general, nonlocal observables such as the product of local observables belonging to different particles at spacelike-separated regions. In this work, we experimentally realize a scheme for nonlocal measurements with the aid of probabilistic quantum erasure. We apply this scheme to the tasks of performing high-accuracy nonlocal measurements of the parity, as well as measurements in the Bell basis, which do not necessitate classical communication between the parties. Unlike other techniques, the nonlocal measurement outcomes are available locally (upon successful postselection). The state reconstructed via performing quantum tomography on the system after the nonlocal measurement indicates the success of the scheme in retrieving nonlocal information while erasing any local data previously acquired by the parties. This measurement scheme allows to realize any controlled-controlled-gate with any coupling strength. Hence, our results are expected to have conceptual and practical applications to quantum communication and quantum computation.

Original languageEnglish
Pages (from-to)1109-1116
Number of pages8
Issue number6
StatePublished - 2019

Bibliographical note

Publisher Copyright:
© 2019 Eliahu Cohen, Chuan-Feng Li et al., published by De Gruyter.


  • nonlocal measurements
  • quantum erasure
  • quantum gates
  • quantum information
  • quantum optics


Dive into the research topics of 'Photonic realization of erasure-based nonlocal measurements'. Together they form a unique fingerprint.

Cite this