Stabilizing spin coherence through environmental entanglement in strongly dissipative quantum systems

Journal Article

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. © 2014 American Physical Society.

Full Text

Duke Authors

Cited Authors

  • Bera, S; Florens, S; Baranger, HU; Roch, N; Nazir, A; Chin, AW

Published Date

  • March 18, 2014

Published In

Volume / Issue

  • 89 / 12

Electronic International Standard Serial Number (EISSN)

  • 1550-235X

International Standard Serial Number (ISSN)

  • 1098-0121

Digital Object Identifier (DOI)

  • 10.1103/PhysRevB.89.121108

Citation Source

  • Scopus