Tuesday, July 23, 2013

1307.5681 (Soumya Bera et al.)

Stabilizing Spin Coherence Through Environmental Entanglement in
Strongly Dissipative Quantum Systems

Soumya Bera, Serge Florens, Harold U. Baranger, Nicolas Roch, Ahsan Nazir, Alex W. Chin
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 and entanglement spectroscopy.
View original: http://arxiv.org/abs/1307.5681

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