期刊
PHYSICAL REVIEW B
卷 89, 期 12, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.89.121108
关键词
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资金
- Grenoble Nanoscience Foundation under RTRA Contract CORTRANO
- US DOE, Division of Materials Sciences and Engineering [DE-SC0005237]
- Imperial College and the University of Manchester
- Winton Programme for the Physics of Sustainability
- U.S. Department of Energy (DOE) [DE-SC0005237] Funding Source: U.S. Department of Energy (DOE)
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.
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