Maximization of thermal entanglement of arbitrarily interacting two qubits

Tomotaka Kuwahara, Naomichi Hatano

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


We investigate the thermal entanglement of interacting two qubits. We maximize it by tuning a local Hamiltonian under a given interaction Hamiltonian. We prove that the optimizing local Hamiltonian takes a simple form which does not depend on the temperature and that the corresponding optimized thermal entanglement decays as 1/(TlnT) at high temperatures. We also find that at low temperatures the thermal entanglement is maximum without any local Hamiltonians and that the second derivative of the maximized thermal entanglement changes discontinuously at the boundary between the high- and low-temperature phases.

Original languageEnglish
Article number062311
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number6
Publication statusPublished - 2011 Jun 10
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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