Entanglement-preserving measurement of the Bell parameter on a single entangled pair

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

doi:10.1117/12.3021541

6 June 2024 Entanglement-preserving measurement of the Bell parameter on a single entangled pair

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

Author Affiliations +

Proceedings Volume PC12993, Quantum Technologies 2024; PC129930R (2024) https://doi.org/10.1117/12.3021541
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Conference Poster

Abstract

Bell tests serve as a fundamental tool in both quantum technologies and quantum foundations investigation. The traditional Bell test framework involves the use of projective measurements, which, because of the wavefunction collapse and the Heisenberg uncertainty principle, do not allow for the full estimation of the Bell parameter from each entangled pair. In this work, we propose a novel weak-measurement-based scheme enabling the complete estimation of the entire Bell parameter from each entangled pair. Moreover, this approach prevents the collapse of the quantum state wavefunction, thereby preserving the entanglement within it. Our results, showing a 6 standard deviations violation of the Bell inequality tested, are obtained while leaving the entanglement within the photon pair almost unaltered after the weak measurement scheme (as demonstrated by our quantum tomographic reconstructions), allowing to exploit it for further foundational or practical purposes.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Francesco Atzori, Salvatore Virzì, Enrico Rebufello, Alessio Avella, Fabrizio Piacentini, Rudi Lussana, Iris Cusini, Francesco Madonini, Federica Villa, Marco Gramegna, Eliahu Cohen, Ivo Pietro Degiovanni, and Marco Genovese "Entanglement-preserving measurement of the Bell parameter on a single entangled pair", Proc. SPIE PC12993, Quantum Technologies 2024, PC129930R (6 June 2024); https://doi.org/10.1117/12.3021541

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