2016/04/01 by Antonio Mandarino, Matteo Bina, Carmen Porto +4
Computer Science · Mathematics · Physics and Astronomy · #Computer science #Continuous variable #Fidelity #Mathematics #Photon #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum discord #Quantum entanglement #Quantum mechanics #Quantum state #Quantum tomography #Qubit #Statistical physics #Statistics #Telecommunications #quant-ph
paper · pdf · doi:10.1103/physreva.93.062118
published as Phys. Rev. A 93, 062118 (2016) · 10 pages, 8 figures, 2 tables
arxiv created 2016/04/01 · openalex publication_date 2016/06/20 · arxiv updated 2016/06/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We experimentally address the significance of fidelity as a figure of merit in quantum state reconstruction of discrete (DV) and continuous-variable (CV) quantum optical systems. In particular, we analyze the use of fidelity in quantum homodyne tomography of CV states and maximum-likelihood polarization tomography of DV ones, focusing attention on nonclassicality, entanglement, and quantum discord as a function of fidelity to a target state. Our findings show that high values of fidelity, despite well quantifying geometrical proximity in the Hilbert space, may be obtained for states displaying opposite physical properties, e.g., quantum or semiclassical features. In particular, we analyze in detail the quantum-to-classical transition for squeezed thermal states of a single-mode optical system and for Werner states of a two-photon polarization qubit system.