Tunneling, decoherence, and entanglement of two spins interacting with a dissipative bath

Mohammad M. Sahrapour, Nancy Makri

Research output: Contribution to journalArticle

Abstract

We use numerically exact iterative path integral methods to investigate the decoherence and entanglement dynamics of a tunneling pair of two coupled qubits (spins) system interacting with a dissipative bath. We find that decoherence is generally accompanied by the destruction of entanglement, although the specifics of this destruction depend sensitively on the parameters of the Hamiltonian (qubit-qubit coupling andor energy bias), the strength of dissipation, the temperature, and the choice of initial condition. We also observe that dissipation can in some cases generate a substantial amount of entanglement. Finally, if an entangled eigenstate exists which does not couple to the environment, the long-time entanglement can significantly exceed the value corresponding to the Boltzmann equilibrium state.

Original languageEnglish (US)
Article number114109
JournalJournal of Chemical Physics
Volume138
Issue number11
DOIs
StatePublished - Mar 21 2013

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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