2012/12/31 by I. A. Silva, Davide Girolami, D. Girolami +11 · 3 citations
Computer Science · Mathematics · Physics and Astronomy · #Algorithm #Amplitude #Bipartite graph #Density matrix #Dimension (graph theory) #Mathematics #Physics #Quantum #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum correlation #Quantum discord #Quantum entanglement #Quantum mechanics #Quantum phase transition #Quantum state #Quantum tomography #Qubit #Scaling #Spectroscopy and Quantum Chemical Studies #State (computer science) #Statistical physics #cond-mat.stat-mech #math-ph #math.MP #nucl-ex #physics.chem-ph #quant-ph
paper · pdf · doi:10.1103/physrevlett.110.140501
published as Phys. Rev. Lett. 110, 140501 (2013) · 5+2 pages, 3+1 figures. Published in PRL
arxiv created 2013/04/03 · openalex publication_date 2013/04/03 · arxiv updated 2013/04/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We report the experimental measurement of bipartite quantum correlations of an unknown two-qubit state. Using a liquid state Nuclear Magnetic Resonance setup and employing geometric discord, we evaluate the quantum correlations of a state without resorting to prior knowledge of its density matrix. The method is applicable to any 2 ⊗ d system and provides, in terms of number of measurements required, an advantage over full state tomography scaling with the dimension d of the unmeasured subsystem. The negativity of quantumness is measured as well for reference. We also observe the phenomenon of sudden transition of quantum correlations when local phase and amplitude damping channels are applied to the state.