Thermometry of ultracold atoms via nonequilibrium work distributions
Thermometry of ultracold atoms via nonequilibrium work distributions
复制标题
通过非平衡功分布进行超冷原子测温
DOI：
10.1103/physreva.93.053619
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发表时间：
2016
影响因子：
2.9
通讯作者：
Johnson T
中科院分区：
文献类型：
--
作者：
Johnson T
估计冷量子系统的温度是困难的。通常人们测量一个很好理解的热状态，并使用该先验知识来推断其温度。相比之下，我们介绍了一种方法的测温，假设系统的状态的知识最少，是潜在的无损。我们的方法使用一个普遍的温度依赖性的淬火动力学的初始热系统耦合到一个量子位探针，从Tasaki-Crooks定理的非平衡工作分布。我们提供了一个冷原子系统的例子，其中我们的温度测量协议可以保持在亚纳米开尔文温度的准确性和精度。
Estimating the temperature of a cold quantum system is difficult. Usually one measures a well-understood thermal state and uses that prior knowledge to infer its temperature. In contrast, we introduce a method of thermometry that assumes minimal knowledge of the state of a system and is potentially nondestructive. Our method uses a universal temperature dependence of the quench dynamics of an initially thermal system coupled to a qubit probe that follows from the Tasaki-Crooks theorem for nonequilibrium work distributions. We provide examples for a cold-atom system, in which our thermometry protocol may retain accuracy and precision at subnano-Kelvin temperatures.