Genuine Multipartite Entanglement Detection with Imperfect Measurements: Concept and Experiment
Standard procedures for entanglement detection assume that experimenters can exactly implement specific quantum measurements. Here, we depart from such idealizations and investigate, in both theory and experiment, the detection of genuine multipartite entanglement when measurements are subject to small imperfections. For arbitrary qubits number n, we construct multipartite entanglement witnesses where the detrimental influence of the imperfection is independent of n. In a tabletop four-partite photonic experiment, we demonstrate first how a small amount of alignment error can undermine the conclusions drawn from standard entanglement witnesses and then perform the correction analysis. Furthermore, since we consider quantum devices that are trusted but not perfectly controlled, we showcase advantages in terms of noise resilience as compared to device-independent models.
Authors
- Armin Tavakoli (ORCID: https://orcid.org/0000-0001-9136-7411)
- Simon Morelli (ORCID: https://orcid.org/0000-0002-7588-2701)
- Philip Walther (ORCID: https://orcid.org/0000-0002-4964-817X)
- Lee A. Rozema (ORCID: https://orcid.org/0000-0003-4580-7871)
- Chao Zhang (ORCID: https://orcid.org/0000-0001-7774-1622)
- Huan Cao (ORCID: https://orcid.org/0000-0001-7171-4148)
Institutions
- University of Science and Technology of China (CN)
- University of Vienna (AT)
- Austrian Academy of Sciences (AT)
- Lund University (SE)
- Basque Center for Applied Mathematics (ES)
- Institute for Quantum Optics and Quantum Information Innsbruck (AT)
- Vienna Center for Quantum Science and Technology (AT)
- Christian Doppler Laboratory for Thermoelectricity (AT)
Publication Details
- Journal
- Physical Review Letters
- Published
- 2024-10-07
- DOI
- https://doi.org/10.1103/physrevlett.133.150201
- Citations
- 17
- Primary Topic
- Quantum Information and Cryptography
- Type
- article
- Field-Weighted Citation Impact
- 5.91
Funders
- Wenner-Gren Foundation
- Österreichische Nationalstiftung für Forschung, Technologie und Entwicklung
- European Commission
- National Natural Science Foundation of China
- Austrian Science Fund
- Eusko Jaurlaritza
- Knut och Alice Wallenbergs Stiftelse
- Ministerio de Ciencia e Innovación
- Christian Doppler Forschungsgesellschaft
- Bundesministerium für Digitalisierung und Wirtschaftsstandort
- Basque Center for Applied Mathematics
- QuantERA
- Horizon 2020 Framework Programme
- Agencia Estatal de Investigación
- Fundamental Research Funds for the Central Universities
- Wallenberg Center for Quantum Technology, Chalmers University of Technology
- Air Force Office of Scientific Research