Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/112427
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dc.titleEntanglement and separability of quantum harmonic oscillator systems at finite temperature
dc.contributor.authorAnders, J.
dc.contributor.authorWinter, A.
dc.date.accessioned2014-11-28T05:01:14Z
dc.date.available2014-11-28T05:01:14Z
dc.date.issued2008-03-01
dc.identifier.citationAnders, J.,Winter, A. (2008-03-01). Entanglement and separability of quantum harmonic oscillator systems at finite temperature. Quantum Information and Computation 8 (3-4) : 245-262. ScholarBank@NUS Repository.
dc.identifier.issn15337146
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/112427
dc.description.abstractthe present paper we study the entanglement properties of thermal (a.k.a. Gibbs) states of quantum harmonic oscillator systems as functions of the Hamiltonian and the temperature. We prove the physical intuition that at sufficiently high temperatures the thermal state becomes fully separable and we deduce bounds on the critical temperature at which this happens. We show that the bound becomes tight for a wide class of Hamiltonians with sufficient translation symmetry. We find, that at the crossover the thermal energy is of the order of the energy of the strongest normal mode of the system and quantify the degree of entanglement below the critical temperature. Finally, we discuss the example of a ring topology in detail and compare our results with previous work in an entanglement-phase diagram. © Rinton Press.
dc.sourceScopus
dc.subjectEntanglement
dc.subjectFull separability
dc.subjectHarmonic chains
dc.subjectThermal states
dc.typeArticle
dc.contributor.departmentCENTRE FOR QUANTUM TECHNOLOGIES
dc.description.sourcetitleQuantum Information and Computation
dc.description.volume8
dc.description.issue3-4
dc.description.page245-262
dc.identifier.isiutNOT_IN_WOS
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