Detector entanglement: Quasidistributions for Bell-state measurements

Year: 2023

Authors: Sperling J., Gianani I., Barbieri M., Agudelo E.

Autors Affiliation: Paderborn Univ, Inst Photon Quantum Syst, Theoret Quantum Sci, Warburger Str 100, D-33098 Paderborn, Germany; Univ Roma Tre, Dipartimento Sci, Via Vasca Navale 84, I-00146 Rome, Italy; CNR, Ist Nazl Ott, Largo Enrico Fermi 6, I-50125 Florence, Italy; Tech Univ Wien, Atominst, Stad Allee 2, A-1020 Vienna, Austria.

Abstract: Measurements in the quantum domain can exceed classical notions. This concerns fundamental questions about the nature of the measurement process itself, as well as applications, such as their function as building blocks of quantum information processing protocols. In this paper we explore the notion of entanglement for detection devices in theory and experiment. A method is devised that allows one to determine nonlocal quantum coherence of positive-operator-valued measures via negative contributions in a joint distribution that fully describes the measurement apparatus under study. This approach is then applied to experimental data for detectors that ideally project onto Bell states. In particular, we describe the reconstruction of the aforementioned entanglement quasidistributions from raw data and compare the resulting negativities with those expected from theory. Therefore, our method provides a versatile toolbox for analyzing measurements regarding their quantum-correlation features for quantum science and quantum technology.

Journal/Review: PHYSICAL REVIEW A

Volume: 107 (1)      Pages from: 12426-1  to: 12426-13

More Information: The authors acknowledge the kind availability of E. Roccia, M. Sbroscia, and M. G. Genoni in sharing the data for our analysis. This work was supported by the FET-OPEN-RIA project STORMYTUNE (Grant AgreementNo. 899587) . J.S. acknowledges financial support from the Deutsche Forschungsgemeinschaft (German Research Foun-dation) through the Collaborative Research Center TRR 142 (Project No. 231447078, project C10) . E.A. acknowl-edges funding from the Der Wissenschaftsfonds Fonds zur Forderung der Wissenschaftlichen Forschung Lise Meitner-Programm (Program No. M3151) .
KeyWords: Quantum; Coherent
DOI: 10.1103/PhysRevA.107.012426

Citations: 1
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