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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2014

Stabilizing Spin Coherence Through Environmental Entanglement in Strongly Dissipative Quantum Systems

Serge Florens
Harold U. Baranger
  • Fonction : Auteur
Nicolas Roch
Ahsan Nazir
  • Fonction : Auteur
  • PersonId : 771836
  • IdRef : 221397094
Alex W. Chin

Résumé

The key feature of a quantum spin coupled to a harmonic bath---a model dissipative quantum system---is competition between oscillator potential energy and spin tunneling rate. We show that these opposing tendencies cause environmental entanglement through superpositions of adiabatic and antiadiabatic oscillator states, which then stabilizes the spin coherence against strong dissipation. This insight motivates a fast-converging variational coherent-state expansion for the many-body ground state of the spin-boson model, which we substantiate via numerical quantum tomography.

Dates et versions

hal-00985086 , version 1 (29-04-2014)

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Soumya Bera, Serge Florens, Harold U. Baranger, Nicolas Roch, Ahsan Nazir, et al.. Stabilizing Spin Coherence Through Environmental Entanglement in Strongly Dissipative Quantum Systems. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2014, 89 (12), pp.121108. ⟨10.1103/PhysRevB.89.121108⟩. ⟨hal-00985086⟩

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