Quantum state estimation of multipartite single-photon path entanglement via local measurements
Multipartite entanglement plays a critical role in various applications of quantum internet. In these applications, the entanglement is usually shared by the distant parties. Experimentally, the distributed entanglement should be estimated by only local measurements. Furthermore, for network experiments, it is desirable to employ measurement techniques that are straightforward to implement. In this paper, we propose a method to measure arbitrary multipartite single-photon path entangled states by only local measurements. By considering practically reasonable assumptions, our method is relatively easy to implement. We experimentally demonstrate the utility of this method by reconstructing the density matrix of a 3-qubit <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mi>W</a:mi></a:math> state.
Authors
- Kazufumi Tanji (ORCID: https://orcid.org/0009-0000-1475-4709)
- Tomoyuki Horikiri (ORCID: https://orcid.org/0000-0003-2564-0058)
- Masahiro Takeoka (ORCID: https://orcid.org/0000-0002-4652-4999)
- Junko Ishi‐Hayase (ORCID: https://orcid.org/0000-0002-4238-305X)
- Aruto Hosaka
- Rikizo Ikuta (ORCID: https://orcid.org/0000-0001-8628-7177)
- Junichiro Yoshimoto (ORCID: https://orcid.org/0000-0001-7995-0321)
- Hikaru Shimizu
Institutions
- Yokohama National University (JP)
- Keio University (JP)
- Akademia Łomżyńska (PL)
- Mitsubishi Electric (United States) (US)
- National Institute of Information and Communications Technology (JP)
- The University of Osaka (JP)
Publication Details
- Journal
- Physical review. A/Physical review, A
- Published
- 2025-02-18
- DOI
- https://doi.org/10.1103/physreva.111.022619
- Citations
- 3
- Primary Topic
- Quantum Information and Cryptography
- Type
- article
- Field-Weighted Citation Impact
- 7.44
Funders
- Ministry of Education, Culture, Sports, Science and Technology
- Japan Science and Technology Agency