Entanglement quasidistributions for Bell-state measurements

• URL: http://arxiv.org/abs/2209.06232v1
• Date: Tue, 13 Sep 2022 18:00:19 GMT
• Title: Entanglement quasidistributions for Bell-state measurements
• Authors: Jan Sperling, Ilaria Gianani, Marco Barbieri, Elizabeth Agudelo
• Abstract summary: 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. We describe the reconstruction of the aforementioned entanglement quasidistributions from raw data and compare the resulting negativities with the expected from theory.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Measurements in the quantum domain 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 the expected from theory. Therefore, our method provides a versatile toolbox for analysing measurements regarding their quantum-correlation features for quantum science and quantum technology.

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