论文标题
探索不对称脉冲调制在量子热机和量子温度计中的作用
Exploring the role of asymmetric-pulse modulation in quantum thermal machines and quantum thermometry
论文作者
论文摘要
我们探索与热浴接触时，定期调节具有不对称脉冲的量子两级系统（TLS）的后果。通过采用Floquet-Lindblad形式主义进行我们的分析，我们发现脉搏的不平等“向上”和“向下”时间持续时间有两个主要分析。首先，由于周期性调制而产生的多个边带或光子扇区的能隙被重新归一化，该术语取决于调制强度以及上升（或向下）持续时间的分数。其次，不同边带的权重不再对称分布在中央频带或零光子扇区上。我们说明了这些发现的优势，在量子热机和温度计中的应用中。对于通过将TLS耦合到两个热浴而构建的热机，我们证明了不对称脉冲对热机的运行方式提供了额外的控制。此外，通过适当调整子带的重量，我们还表明，不对称脉冲可以在最近提出的量子温度测定方案中提供优质的最优性，在该方案中，已经显示动态控制可以增强测量的精度。
We explore the consequences of periodically modulating a quantum two-level system (TLS) with an asymmetric pulse when the system is in contact with thermal baths. By adopting the Floquet-Lindblad formalism for our analysis, we find that the unequal "up" and "down" time duration of the pulse has two main ramifications. First, the energy gap of the multiple sidebands or photon sectors created as a result of the periodic modulation are renormalized by a term which is dependent on both the modulation strength as well as the fraction of up (or down) time duration. Second, the weights of the different sidebands are no longer symmetrically distributed about the central band or zero photon sector. We illustrate the advantages of these findings in the context of applications in quantum thermal machines and thermometry. For a thermal machine constructed by coupling the TLS to two thermal baths, we demonstrate that the asymmetric pulse provides an extra degree of control over the mode of operation of the thermal machine. Further, by appropriately tuning the weight of the subbands, we also show that an asymmetric pulse may provide superior optimality in a recently proposed protocol for quantum thermometry, where dynamical control has been shown to enhance the precision of measurement.
