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International Conference Laser Optics (ICLO)

Improving metrological characteristics in quantum frequency standard with laser pumping

Anton Valov, Nikita A. Lukashev, Vadim Vladimirovich Davydov, Vladislav A. Kruglov, Vladislav S. Reznik, V. Yu. Rud’

Published Nov 2, 2020• 0 citations
Publisher

Abstract

The necessity of using quantum frequency standard with laser pumping in satellite navigation systems is considered. The experimental results of improving the metrological characteristics of the standard using median filtering are presented.
DOI
10.1109/iclo48556.2020.9285644

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Abstract The necessity of improving the metrological characteristics of a quantum frequency standard when determining the coordinates of an object on the Earth’s surface or long-term transmission of large amounts of data in satellite communication systems is substantiated. A new algorithm for digital processing of optical signals in the frequency standard is proposed. The results of experimental studies of the metrological characteristics of a quantum frequency standard based on rubidium atoms - 87 are presented
The necessity of improving the characteristics of metrological for quantum standard of frequency when determining the coordinates of an object on the Earth’s surface or long-term broadcast of large quantity of data in satellite communication systems justified. A new algorism for digital processing of optical signals in the frequency standard is proposed to obtain information about the accuracy signal with making the method of median filtering. The results a research of experimental a characteristics of metrological for quantum standard of frequency based to rubidium - 87 atoms are presented. It is found that improving the long-term frequency stability by 5% using the new algorithm lower the number of bit errors for a long broadcasting information by at least 3%. Also, the error of determining the coordinates of the object is increased by at least 15%.
The problem of developing control algorithms in quantum frequency standards based on the effect of coherent population trapping is considered. The development of such algorithms will make it possible to create frequency standards with metrological characteristics that are not inferior to the characteristics of rubidium frequency standards, with reduced power consumption and overall dimensions. A method for studying the dependence of the actual value and frequency instability of quantum frequency standards based on the effect of coherent population trapping on the operating modes of individual parts of the standards is presented. As a criterion for optimizing the laser injection current, the output power of the microwave generator, and the cell temperature, we chose to minimize the effect on the shift of the actual frequency of the standard. A comparative analysis of methods for changing the radiation intensity of a surface-emitting laser with a vertical resonator has been carried out and control algorithms have been developed that take into account the features of these methods. Based on these algorithms, software and tuning methods have been developed in quantum frequency standards based on the effect of coherent population trapping. For the prototype standard, the results of measuring the frequency instability are shown. It is shown that control algorithms and tuning methods can qualitatively change the metrological characteristics of quantum frequency standards based on the effect of coherent population trapping.