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EnglishInformation 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.
| Titolo: | Optimal Correlations in Many-Body Quantum Systems |
| Autori: | |
| Data di pubblicazione: | 2012 |
| Rivista: | |
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1103/PhysRevLett.108.240503 |
| Handle: | http://hdl.handle.net/11384/10611 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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http://hdl.handle.net/11384/10611
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