量子测温传感：本地方法与远程方法
Quantum thermometric sensing: Local vs. Remote approaches
AI总结：
本文基于电容耦合双量子比特平台，用 QFI 与 HSS 比较本地直接测温和量子隐形传态远程测温，证明直接测量更灵敏，并给出参数优化规律。
摘要：
本文研究利用量子传感器的量子测温，重点关注由量子估计理论导出的基本精度界限。所提出的传感平台由两个通过电容耦合的不同量子比特组成，在热环境存在时会引发量子振荡。热平衡态采用 Gibbs 分布建模。精度极限通过量子 Fisher 信息（QFI）和 Hilbert–Schmidt 速度（HSS）进行评估，二者作为传感器灵敏度的严格判据。对 QFI 和 HSS 关于可调参数（例如量子比特能量与耦合强度）依赖性的系统分析，为最大化温度灵敏度提供了优化路径。此外，我们探索了两种不同的量子测温范式：（I）由 Alice 直接执行的本地温度估计，她拥有与热浴接口的量子传感器；（II）由 Bob 执行的远程温度估计，借助量子隐形传态实现。在后一种情形中，编码在量子比特态中的温度信息通过单量子比特量子热隐形传态协议传输。我们的结果表明，直接测量相比远程估计能产生更优的灵敏度，这主要源于传感器与环境直接相互作用的内在优势。分析揭示，增大 Josephson 能量会降低传感器灵敏度，而增强量子比特之间的相互耦合强度则会提高灵敏度。
英文摘要：
Quantum thermometry leveraging quantum sensors is investigated with an emphasis on fundamental precision bounds derived from quantum estimation theory. The proposed sensing platform consists of two dissimilar qubits coupled via capacitor, which induce quantum oscillations in the presence of a thermal environment. Thermal equilibrium states are modeled using the Gibbs distribution. The precision limits are assessed through the Quantum Fisher Information (QFI) and the Hilbert-Schmidt Speed (HSS), serving as stringent criteria for sensor sensitivity. Systematic analysis of the dependence of QFI and HSS on tunable parameters -such as qubit energies and coupling strengths- provides optimization pathways for maximizing temperature sensitivity. Furthermore, we explore two distinct quantum thermometry paradigms: (I) local temperature estimation directly performed by Alice, who possesses the quantum sensor interfacing with the thermal bath, and (II) remote temperature estimation conducted by Bob, facilitated via quantum teleportation. In the latter scenario, temperature information encoded in the qubit state is transmitted through a single-qubit quantum thermal teleportation protocol. Our findings indicate that direct measurement yields superior sensitivity compared to remote estimation, primarily due to the inherent advantage of direct sensor-environment interaction. The analysis reveals that increasing Josephson energies diminishes sensor sensitivity, whereas augmenting the mutual coupling strength between the qubits enhances it.
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