On the discrimination between classical and quantum states
G. Brida, M. Bondani, I. P. Degiovanni, M. Genovese, M. G. A. Paris,, I. Ruo Berchera, V. Schettini
TL;DR
This paper compares three measures of quantum properties in bipartite optical systems, focusing on their application to different quantum states and their potential for foundational and technological research.
Contribution
It introduces and analyzes three quantumness quantifiers for bipartite optical systems, providing detailed case studies on various quantum states.
Findings
Quantumness measures effectively distinguish between different quantum states.
Thermal, coherent, and squeezed states show distinct quantumness signatures.
The tools aid in understanding quantum correlations for foundational and technological applications.
Abstract
With the purpose to introduce a useful tool for researches concerning foundations of quantum mechanics and applications to quantum technologies, here we study three quantumness quantifiers for bipartite optical systems: one based on sub-shot-noise correlations, one related to antibunching and one springing from entanglement determination. The specific cases of parametric down conversion seeded by thermal, coherent and squeezed states are discussed in detail.
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