论文标题
反旋转波术语对非平衡Qubit-Phonon混合系统中量子传热和声子统计的影响
Impact of counter-rotating-wave term on quantum heat transfer and phonon statistics in nonequilibrium qubit-phonon hybrid system
论文作者
论文摘要
传统上，反旋转波术语（CRWT）在具有强大的系统浴力耗散的开放小量子系统中至关重要。在这里，通过在非平衡Qubit-Phonon杂交模型中进行体现，我们表明CRWT即使在弱系统浴中耗散的情况下，CRWT也可以在量子传热中起重要作用。通过使用相干的声子状态，我们分别获得了由旋转波（RWT）和CRWT贡献的量子主方程。我们发现，仅包括RWT，稳态热电流和电流波动将在较大的温度偏置下受到显着抑制，而通过考虑CRWT的另外，它们会大大增强它们。此外，对于声子统计，仅使用RWTS的平均声子数和两声相关对强的Qubit-Phonon杂交几乎不敏感，而它们将通过CRWT基于CRWT的合作过渡来大大冷却它们。因此，应仔细处理量子传热系统中的CRWT。
Counter-rotating-wave terms (CRWTs) are traditionally viewed to be crucial in open small quantum systems with strong system-bath dissipation. Here by exemplifying in a nonequilibrium qubit-phonon hybrid model, we show that CRWTs can play the significant role in quantum heat transfer even with weak system-bath dissipation. By using coherent phonon states, we obtain the quantum master equation with heat exchange rates contributed by rotating-wave-terms (RWTs) and CRWTs, respectively. We find that including only RWTs, steady state heat current and current fluctuations will be significantly suppressed at large temperature bias, whereas they are strongly enhanced by considering CRWTs in addition. Furthermore, for the phonon statistics, the average phonon number and two-phonon correlation are nearly insensitive to strong qubit-phonon hybridization with only RWTs, whereas they will be dramatically cooled down via the cooperative transitions based on CRWTs in addition. Therefore, CRWTs in quantum heat transfer system should be treated carefully.
