Quantum metrology for relativistic quantum fields
Quantum metrology for relativistic quantum fields
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DOI：
10.1103/physrevd.89.065028
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发表时间：
2014-03-20
影响因子：
5
通讯作者：
Fuentes, Ivette
中科院分区：
文献类型：
--
作者：
Ahmadi, Mehdi;Bruschi, David Edward;Fuentes, Ivette
在量子计量学中，压缩和纠缠等量子特性被用于设计新一代时钟、传感器和其他测量设备，这些设备的性能可以超过经典的同类设备。具有重大技术相关性的应用在于精确测量在相对论中起核心作用的参数，如适当的加速度、相对距离、时间和引力场强度。在这篇文章中，我们概括了最近引入的在平坦和弯曲时空中的量子场论中估计物理量的技术。我们考虑一个经过一般变换的玻色量子场，它编码了要估计的参数。对于单模和双模高斯信道，我们给出了用Bogoliubov系数来估计小参数的最佳精确界的解析公式。
In quantum metrology quantum properties such as squeezing and entanglement are exploited in the design of a new generation of clocks, sensors and other measurement devices that can outperform their classical counterparts. Applications of great technological relevance lie in the precise measurement of parameters which play a central role in relativity, such as proper accelerations, relative distances, time and gravitational field strengths. In this paper we generalize recently introduced techniques to estimate physical quantities within quantum field theory in flat and curved space-time. We consider a bosonic quantum field that undergoes a generic transformation, which encodes the parameter to be estimated. We present analytical formulas for optimal precision bounds on the estimation of small parameters in terms of Bogoliubov coefficients for single-mode and two-mode Gaussian channels.