论文标题
降低噪声下的多参数量子估计
Multiparameter quantum estimation under dephasing noise
论文作者
论文摘要
多个参数的同时量子估计最近在量子计量学中变得至关重要。尽管在无噪声环境中多参数量子估计的最终灵敏度可以超过每个经典传感器都受每个经典传感器界限的标准量子限制，但尚不清楚量子传感器在现实噪声下是否比经典的传感器具有优势。在这项工作中，我们提出了一个在某个嘈杂环境中具有量子传感器的多个参数估算的框架。我们要估计的多个参数是外部磁场的三个组成部分，我们考虑只会导致dephasing的噪声。我们表明，在嘈杂的环境中有一个最佳的感应时间，当嘈杂的环境是非马克维亚人时，灵敏度可以超过标准的量子限制。
Simultaneous quantum estimation of multiple parameters has recently become essential in quantum metrology. Although the ultimate sensitivity of a multiparameter quantum estimation in noiseless environments can beat the standard quantum limit that every classical sensor is bounded by, it is unclear whether the quantum sensor has an advantage over the classical one under realistic noise. In this work, we present a framework of the simultaneous estimation of multiple parameters with quantum sensors in a certain noisy environment. Our multiple parameters to be estimated are three components of an external magnetic field, and we consider the noise that causes only dephasing. We show that there is an optimal sensing time in the noisy environment and the sensitivity can beat the standard quantum limit when the noisy environment is non-Markovian.
