2021/06/17 by Arghya Das, Anal Bhowmik, Das, Arghya +5
Physics and Astronomy · Decision Sciences · #Cold Atom Physics and Bose-Einstein Condensates #Advanced Frequency and Time Standards #Scientific Measurement and Uncertainty Evaluation
paper · pdf · doi:10.48550/arxiv.2106.09607
Ionic clocks exhibit as the most promising candidates for the frequency\nstandards. Recent investigations show the profound advantages of interrogating\ntwo laser beams with different frequencies in developing the frequency\nstandards. Here we present a scheme of a two-photon mechanism to calculate the\ndynamic polarizabilities for the clock states, 62S\(1)/(2) and\n52D\(3)/(2), \(5)/(2), of Ba+ by employing relativistic\ncoupled-cluster method. We illustrate the Stark-shift cancellation between\nthese clock states at the two-photon magic wavelengths. These magic wavelengths\ncan be essential inputs to achieve better accuracy in the ionic clock\nexperiments. We also calculate the magic wavelengths under the single-photon\ninteraction to serve as the reference and for a comparative study. The\ncalculated single- and two-photon magic wavelengths lie in the optical region\nand thus are significant for future state-of-the-art experiments. Moreover, as\nan application of the two-photon polarizabilities, we investigate the impact of\nthese polarizabilities on the spin-mixing processes, |0,0\⟩\n\↔ |+1,-1\⟩ and |0,0\⟩ \↔\n|-1,+1\⟩, of an ultra-cold spin-1 mixture of the 137Ba+ and\n87Rb atoms. We determine the protocols of selecting these spin-mixing\noscillations by changing the strength of an externally applied magnetic field\nand the frequencies of the interrogating laser beams.\n