2011/04/19 by R. Auccaise, Lucas C. Céleri, L. C. Celeri +13 · 159 citations
Computer Science · Physics and Astronomy · #Open quantum system #Physics #Quantum #Quantum Information and Cryptography #Quantum discord #Quantum dynamics #Quantum entanglement #Quantum information #Quantum information science #Quantum mechanics #Quantum optics and atomic interactions #Quantum phase transition #Spectroscopy and Quantum Chemical Studies #Statistical physics #quant-ph
paper · pdf · doi:10.1103/physrevlett.107.140403
published in Physical Review Letters 107(14), 140403 (American Physical Society)
arxiv created 2011/04/19 · openalex publication_date 2011/09/30 · arxiv updated 2011/11/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Nonclassical correlations play a crucial role in the development of quantum information science. The recent discovery that nonclassical correlations can be present even in separable (nonentangled) states has broadened this scenario. This generalized quantum correlation has been increasing in relevance in several fields, among them quantum communication, quantum computation, quantum phase transitions, and biological systems. We demonstrate here the occurrence of the sudden-change phenomenon and immunity against some sources of noise for the quantum discord and its classical counterpart, in a room temperature nuclear magnetic resonance setup. The experiment is performed in a decohering environment causing loss of phase relations among the energy eigenstates and exchange of energy between system and environment, resulting in relaxation to the Gibbs ensemble.