Single-pair measurement of the Bell parameter

Since their formulation, Bell inequalities have been one of the pillars of quantum foundations and quantum information, also representing a tool of the utmost relevance for quantum technologies, e.g. for quantum communication A long path, awarded by the 2022 Nobel prize, has gone along since their introduction, finally reaching conclusive Bell inequality violations in 2015. However, none of the experiments run so far was able to extract information on the entire Bell inequality from every entangled pair measured, because of the wavefunction collapse. Here we illustrate an actual paradigm shift in this perspective, since we experimentally demonstrate the possibility of extracting information on the full Bell parameter (specifically the CHSH one) from each entangled pair measured and, at the same time, still conserving most of the pair entanglement after the measurement.

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Publication Details

Published
2025-03-19
DOI
https://doi.org/10.1117/12.3040665
Primary Topic
Cold Atom Physics and Bose-Einstein Condensates
Type
article
Field-Weighted Citation Impact
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article

Single-pair measurement of the Bell parameter

Federica Villa, Enrico Rebufello, Marco Genovese, Francesca Madonini et al.
Cold Atom Physics and Bose-Einstein Condensates
article

Single-pair measurement of the Bell parameter

Federica Villa, Enrico Rebufello, Marco Genovese, Francesca Madonini, Salvatore Virzì, Marco Gramegna, Iris Cusini, Ivo Pietro Degiovanni, Alessio Avella, Rudi Lussana, Francesco Atzori, Eliahu Cohen, Fabrizio Piacentini
article en

Abstract

Since their formulation, Bell inequalities have been one of the pillars of quantum foundations and quantum information, also representing a tool of the utmost relevance for quantum technologies, e.g. for quantum communication A long path, awarded by the 2022 Nobel prize, has gone along since their introduction, finally reaching conclusive Bell inequality violations in 2015. However, none of the experiments run so far was able to extract information on the entire Bell inequality from every entangled pair measured, because of the wavefunction collapse. Here we illustrate an actual paradigm shift in this perspective, since we experimentally demonstrate the possibility of extracting information on the full Bell parameter (specifically the CHSH one) from each entangled pair measured and, at the same time, still conserving most of the pair entanglement after the measurement.

Bar-Ilan University (IL), Istituto Nazionale di Ricerca Metrologica (IT), Politecnico di Milano (IT)
Openalex Percentile: Top 96%
Cold Atom Physics and Bose-Einstein Condensates
DOISourceOpenAlex
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Single-pair measurement of the Bell parameter — Federica Villa, Enrico Rebufello, et al. · (2025) | TGRS Research Map | TGRS