Stabilizing spin coherence through environmental entanglement in strongly dissipative quantum systems

被引：61

作者：

Bera, Soumya ^{[1
,2
]}

Florens, Serge ^{[1
,2
]}

Baranger, Harold U. ^{[3
]}

Roch, Nicolas ^{[1
,2
,4
]}

Nazir, Ahsan ^{[5
,6
]}

Chin, Alex W. ^{[7
]}

机构：

[1] CNRS, Inst Neel, F-38042 Grenoble, France

[2] Univ Grenoble Alpes, F-38042 Grenoble, France

[3] Duke Univ, Dept Phys, Durham, NC 27708 USA

[4] Univ Paris 07, Univ Paris 06, CNRS, Lab Pierre Aigrain,Ecole Normale Super,UMR 8551, F-75231 Paris 05, France

[5] Univ London Imperial Coll Sci Technol & Med, Blackett Lab, London SW7 2AZ, England

[6] Univ Manchester, Photon Sci Inst, Manchester M13 9PL, Lancs, England

[7] Univ Cambridge, Theory Condensed Matter Grp, Cambridge CB3 0HE, England

来源：

PHYSICAL REVIEW B | 2014年 / 89卷 / 12期

关键词：

VARIATIONAL CALCULATION; 2-STATE SYSTEM; 2-LEVEL SYSTEM; DYNAMICS; STATES; BATH;

D O I：

10.1103/PhysRevB.89.121108

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页数：5

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