Abstract
The term “quantum microwave measurement” stands for the measurement of microwave parameters by exploiting the properties of atomic energy levels and related transitions in presence of optical/laser signal. In other words, it can be stated that atoms work like a transducer, converting microwave E-Field and H-Field strengths into observable changes in optical signals. A real-time application of microwave in this domain was first investigated by Christopher and their group, where they have sensed RF electric field strength by measuring the frequency split of electromagnetically induced transparency signal in the presence RF field applied between the Rydberg states (Holloway et al. 2014a). The beauty of this experiment was that the RF E-Field strength could be made directly traceable to Planck’s constant thus reducing the uncertainties associated with other methods of measurement of E-Field using various classical probes. After that, numerous research was done by various researchers and still undergoing utilizing the optical and microwave field interaction with Rydberg atom-based systems, such as broadband RF E-Field sensing, frequency modulation, frequency up-conversion, frequency down-conversion, etc. The interaction of electromagnetic field with atomic system results in specific phenomena such as EIT and ATS (Boller et al. 1991; Marangos 1997; Anisimov et al. 2011), which also form the basis of all these applications. Therefore, in this chapter first we will discuss basic properties of Rydberg atoms, followed by the interaction of electromagnetic field with two-level atomic system. Later, EIT and ATS phenomena in a three-level system and applications will be discussed. Some of the devices based on these phenomena such as electric field sensors, microwave mixers as well as receiver for communication purposes will also be discussed in detail. As Rydberg atoms are the heart of the Quantum Microwave Measurements, different methods of fabrication of atomic vapor cells with their advantages and disadvantages will also be discussed in brief.
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Aneja, Y., Thakran, M., Sharma, A.K., Rawat, H.S., Dubey, S.K. (2023). Quantum Microwave Measurements. In: Aswal, D.K., Yadav, S., Takatsuji, T., Rachakonda, P., Kumar, H. (eds) Handbook of Metrology and Applications. Springer, Singapore. https://doi.org/10.1007/978-981-19-1550-5_79-2
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DOI: https://doi.org/10.1007/978-981-19-1550-5_79-2
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Quantum Microwave Measurements- Published:
- 06 June 2023
DOI: https://doi.org/10.1007/978-981-19-1550-5_79-2
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Quantum Microwave Measurements- Published:
- 29 March 2023
DOI: https://doi.org/10.1007/978-981-19-1550-5_79-1