论文标题
临界量子温度计及其在自旋系统中的可行性
Critical quantum thermometry and its feasibility in spin systems
论文作者
论文摘要
在这项工作中，我们研究了有限尺寸的强相关系统，表现出量子相变。我们使用量子Fisher信息（QFI）方法来量化温度估计中的灵敏度，并应用有限尺寸的缩放框架将这种敏感性与系统的关键指数围绕关键点链接起来。我们从数值上计算两个实验可实现系统的临界点周围的QFI：在存在外部磁场的情况下，Spin-1 Bose-Einstein冷凝物和自旋链Heisenberg XX模型。我们的结果证实了QFI的有限尺寸缩放特性。此外，我们讨论了（几乎）（几乎）在这两个系统的临界点上饱和QFI的实验可访问的可观察结果。
In this work, we study temperature sensing with finite-sized strongly correlated systems exhibiting quantum phase transitions. We use the quantum Fisher information (QFI) approach to quantify the sensitivity in the temperature estimation, and apply a finite-size scaling framework to link this sensitivity to critical exponents of the system around critical points. We numerically calculate the QFI around the critical points for two experimentally-realizable systems: the spin-1 Bose-Einstein condensate and the spin-chain Heisenberg XX model in the presence of an external magnetic field. Our results confirm finite-size scaling properties of the QFI. Furthermore, we discuss experimentally-accessible observables that (nearly) saturate the QFI at the critical points for these two systems.
