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

doi:10.1103/PhysRevB.89.121108

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

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Abstract

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.

Original language	English
Article number	121108
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	89
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevB.89.121108
Publication status	Published - 18 Mar 2014

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abstract = "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. {\textcopyright} 2014 American Physical Society.",

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AU - Roch, Nicolas

AU - Nazir, Ahsan

AU - Chin, Alex W.

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N2 - 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.

AB - 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.

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DO - 10.1103/PhysRevB.89.121108

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Stabilizing spin coherence through environmental entanglement in strongly dissipative quantum systems

Abstract

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