论文标题
通过热层内系统耦合的局部连贯性
Local coherence by thermalized intra-system coupling
论文作者
论文摘要
如果这种耦合具有适当的复合性质，则能量本征的量子叠加可以在单个量子两级系统中自主出现，该系统耦合到低温热浴中。我们在这里提出了一种主要不同，更可行的方法，该方法采用工程相互作用，通过在温度$ t $的温度下弱耦合的热浴，两级系统之间的工程相互作用将被热化为全球吉布斯州。因此，在这种情况下，量子相干性通过不同的机制出现，而系统浴耦合不必进行设计。我们证明了这种自主相干性产生达到最大相干值。此外，它可以通过与几个两级系统使用较弱但集体的互动来构建。这种方法超过了工程系统浴耦合产生的相似性，以实现可比的相互作用强度，并直接减少量子传感中的相位估计误差。这是朝着自主量子传感的必要步骤。
Quantum superposition of energy eigenstates can appear autonomously in a single quantum two-level system coupled to a low-temperature thermal bath, if such coupling has a proper composite nature. We propose here a principally different and more feasible approach employing engineered interactions between two-level systems being thermalized into a global Gibbs state by weakly coupled thermal bath at temperature $T$. Therefore, in such case quantum coherence appears by a different mechanism, whereas the system-bath coupling does not have to be engineered. We demonstrate such autonomous coherence generation reaching maximum values of coherence. Moreover, it can be alternatively built up by using weaker but collective interaction with several two-level systems. This approach surpasses the coherence generated by the engineered system-bath coupling for comparable interaction strengths and directly reduces phase estimation error in quantum sensing. This represents a necessary step towards the autonomous quantum sensing.
