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. RI Rossini, Davide/A-8156-2012
Optimal Correlations in Many-Body Quantum Systems / Amico, L; Rossini, D; Hamma, A; Korepin, Ve. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 108:24(2012). [10.1103/PhysRevLett.108.240503]
Optimal Correlations in Many-Body Quantum Systems
Hamma A;
2012
Abstract
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. RI Rossini, Davide/A-8156-2012File | Dimensione | Formato | |
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