Zero field entanglement in dipolar coupling spin system at negative temperature

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Abstract

A dipolar coupled spin system can achieve internal thermodynamic equilibrium states at negative absolute temperature. We study analytically and numerically the temperature dependence of the concurrence in a dipolar coupled spin-1/2 system in both nonzero and zero fields and show that, at negative temperatures, entangled states can exist even in zero magnetic field.

Original languageEnglish
Article number1350050
JournalInternational Journal of Quantum Information
Volume11
Issue number5
DOIs
StatePublished - 1 Jan 2013

Keywords

  • Dipole-dipole interactions
  • Entanglement
  • Negative temperature
  • Zero field

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