论文标题
量子温度计和量子发动机增强功能的集体热容量
Collective heat capacity for quantum thermometry and quantum engine enhancements
论文作者
论文摘要
热平衡中量子温度计的性能以及某些量子发动机的输出功率具有共同的特征：两者都取决于探针或工作培养基的热容量。在注意到可以通过与热浴的集体耦合来显着修改自旋组合的热容量之后，我们建立在上述观察结果上，以研究这种集体效应对量子温度计和量子发动机的各自影响。我们发现，在高温下，温度估计的精度大大提高，甚至达到了海森堡缩放 - 与旋转数量成反比。对于接近Carnot效率的Otto发动机，集体耦合始终增强输出功率。建议一些有形的实验平台。
The performances of quantum thermometry in thermal equilibrium together with the output power of certain class of quantum engines share a common characteristic: both are determined by the heat capacity of the probe or working medium. After noticing that the heat capacity of spin ensembles can be significantly modified by collective coupling with a thermal bath, we build on the above observation to investigate the respective impact of such collective effect on quantum thermometry and quantum engines. We find that the precision of the temperature estimation is largely increased at high temperatures, reaching even the Heisenberg scaling - inversely proportional to the number of spins. For Otto engines operating close to the Carnot efficiency, collective coupling always enhances the output power. Some tangible experimental platforms are suggested.
