2011/12/31 by Luigi Amico, Davide Rossini, Alioscia Hamma +2 · 17 citations
Computer Science · Physics and Astronomy · #Advanced Thermodynamics and Statistical Mechanics #Coherence (philosophical gambling strategy) #Open quantum system #Physics #Quantum #Quantum Information and Cryptography #Quantum discord #Quantum dynamics #Quantum information #Quantum many-body systems #Quantum mechanics #Quantum metrology #Quantum phase transition #Quantum phases #Quantum process #Quantum system #Spin (aerodynamics) #Statistical physics #cond-mat.stat-mech #quant-ph
paper · pdf · doi:10.1103/physrevlett.108.240503
published in Physical Review Letters 108(24), 240503 (American Physical Society) · 5 pages, 5 figures + supplementary material. To be published in PRL
arxiv created 2012/05/22 · openalex publication_date 2012/06/15 · arxiv updated 2012/06/20 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Information and correlations in a quantum system are closely related through the process of measurement. We explore such relation in a many-body quantum setting, effectively bridging between quantum metrology and condensed matter physics. To this aim we adopt the information-theory view of correlations and study the amount of correlations after certain classes of positive-operator-valued measurements are locally performed. As many-body systems, we consider a one-dimensional array of interacting two-level systems (a spin chain) at zero temperature, where quantum effects are most pronounced. We demonstrate how the optimal strategy to extract the correlations depends on the quantum phase through a subtle interplay between local interactions and coherence.