论文标题
分数频率的动力相和量子热
Dynamical phase and quantum heat at fractional frequencies
论文作者
论文摘要
我们演示了热量的真正量子特征：在连续驾驶的情况下，量子量（量子两级系统）发出的功率（量子两级系统）发出的峰值，这是频率$ f $的函数。这些共振特征由于驾驶过程中动力学阶段的积累而出现。 $ n $ th的最大位置由$ f = f = f _ {\ rm m}/n $，其中$ f _ {\ rm m} $是周期中Qubit的平均频率，它们的位置独立于驱动器的形式，并且连接的热量浴的数量，甚至是光浴的存在，甚至是光谱过滤的存在。我们表明，驱动器的波形决定了峰的强度，对于奇数甚至共振而言，驱动器的强度有所不同。预计这种量子热将在驱动的热设备（例如量子热发动机和冰箱）的性能中起着至关重要的作用。我们还表明，通过优化周期协议，我们在快速驱动的系统中恢复了有利的经典限制，而无需使用反浸润驱动方案，并证明了保留非整体过程的熵。我们建议，可以通过观察到由电阻器作为连接到驱动的超导量子的钢计吸收的稳态功率来检测到这种非平凡的量子热。
We demonstrate a genuine quantum feature of heat: the power emitted by a qubit (quantum two-level system) into a reservoir under continuous driving shows peaks as a function of frequency $f$. These resonant features appear due to the accumulation of the dynamical phase during the driving. The position of the $n$th maximum is given by $f=f_{\rm M}/n$, where $f_{\rm M}$ is the mean frequency of the qubit in the cycle, and their positions are independent of the form of the drive and the number of heat baths attached, and even the presence or absence of spectral filtering. We show that the waveform of the drive determines the intensity of the peaks, differently for odd and even resonances. This quantum heat is expected to play a crucial role in the performance of driven thermal devices such as quantum heat engines and refrigerators. We also show that by optimizing the cycle protocol, we recover the favorable classical limit in fast driven systems without the use of counter-diabatic drive protocols and we demonstrate an entropy preserving non-unitary process. We propose that this non-trivial quantum heat can be detected by observing the steady-state power absorbed by a resistor acting as a bolometer attached to a driven superconducting qubit.
