论文标题
关于一类量子传感器的能力
On the capability of a class of quantum sensors
论文作者
论文摘要
量子传感器可能会提供极高的灵敏度和精度，以在量子或经典物理系统中提取关键信息。一个基本的问题是，量子传感器是否能够在系统中为量子传感器的给定结构和在传感器上提供可允许的测量的系统中唯一推断未知参数。在本文中，我们研究了由单个量子或两个量子位组成的一类量子传感器的能力。量子传感器与自旋链系统耦合，以提取系统中未知参数的信息。通过给定的初始化和测量方案，我们采用了相似性转化方法，而Grobner基依据方法证明单量量子传感器无法有效地估计自旋链系统中未知参数，而两量量子量子传感器CAN。这项工作表明，通过增加一些实际应用中量子传感器中的量子位数来增强量子传感器的能力，这是一种可行的方法。
Quantum sensors may provide extremely high sensitivity and precision to extract key information in a quantum or classical physical system. A fundamental question is whether a quantum sensor is capable of uniquely inferring unknown parameters in a system for a given structure of the quantum sensor and admissible measurement on the sensor. In this paper, we investigate the capability of a class of quantum sensors which consist of either a single qubit or two qubits. A quantum sensor is coupled to a spin chain system to extract information of unknown parameters in the system. With given initialisation and measurement schemes, we employ the similarity transformation approach and the Grobner basis method to prove that a single-qubit quantum sensor cannot effectively estimate the unknown parameters in the spin chain system while the two-qubit quantum sensor can. The work demonstrates that it is a feasible method to enhance the capability of quantum sensors by increasing the number of qubits in the quantum sensors for some practical applications.
