Unifying quantum heat transfer in a nonequilibrium spin-boson model with full counting statistics
Unifying quantum heat transfer in a nonequilibrium spin-boson model with full counting statistics
复制标题
将非平衡自旋玻色子模型中的量子传热与完整计数统计统一起来
DOI：
10.1103/physreva.95.023610
复制
发表时间：
2016-12
影响因子：
2.9
通讯作者：
Cao Jianshu
中科院分区：
文献类型：
--
作者：
Wang Chen;Ren Jie;Cao Jianshu
为了研究驱动非平衡自旋玻色子模型中量子传热的完整计数统计，我们开发了一个带有辅助计数场的广义非平衡极化子变换雷德菲尔德方程。这使我们能够研究从弱到强的量子比特浴耦合的影响。在没有外部调制的情况下，我们在中等耦合状态下观察到稳态热通量和噪声功率的最大值，低于该值我们发现这两个传输量因有限量子位能量偏差而增强。通过外部调制，在零量子位能量偏置（无偏置）下，随着量子位-浴耦合的增加，几何相位引起的热通量表现出单调减少。在有限量子位能量偏置（有偏置）下，几何相引起的热通量在强耦合状态下表现出有趣的反转行为。我们的结果统一了弱和强量子位浴耦合机制中看似矛盾的结果，并为非平衡传热的量子涨落提供了详细的剖析。
To study the full counting statistics of quantum heat transfer in a driven nonequilibrium spin-boson model, we develop a generalized nonequilibrium polaron-transformed Redfield equation with an auxiliary counting field. This enables us to study the impact of qubit-bath coupling ranging from weak to strong regimes. Without external modulations, we observe maximal values of both steady state heat flux and noise power at moderate coupling regimes, below which we find those two transport quantities are enhanced by the finite qubit energy bias. With external modulations, the geometric-phase-induced heat flux shows monotonic decrease as increasing the qubit-bath coupling at zero qubit energy bias (without bias). While under finite qubit energy bias (with bias), the geometric-phase-induced heat flux exhibits an interesting reversal behavior in strong coupling regime. Our results unify the seemingly contradictory results in weak and strong qubit-bath coupling regimes, and provide detailed dissections for the quantum fluctuation of nonequilibrium heat transfer.
DOI：
10.1142/1476
发表时间：
1993-03
期刊：
--
影响因子：
--
作者：
U. Weiss
通讯作者：
U. Weiss
DOI：
10.1364/opn.30.4.000042
发表时间：
2019-04
期刊：
Optics and Photonics News
影响因子：
--
作者：
S. Wills
通讯作者：
S. Wills