| 研究課題/領域番号 |
19K05316
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| 研究機関 | 沖縄科学技術大学院大学 |
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研究代表者 |
NICCHORMAIC SILE 沖縄科学技術大学院大学, 量子技術のための光・物質相互作用ユニット, 教授 (10715288)
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| 研究期間 (年度) |
2019-04-01 – 2022-03-31
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| キーワード | cold atoms / optical nanofibre / Rydberg / evanescent field / spin selection / dipole trap |
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| 研究実績の概要 |
We have developed a method for frequency scanning a 482 nm laser by stabilising it using electromagnetically induced transparency.
We have devised a method for polarisation control of the light in the nanofibre's evanescent field. We have explored the spin selection rules for S to S transitions under two photon excitation in both the paraxial and non-paraxial regimes.
We have been able to observe the Rb 5S to 4D electric quadrupole transition at very low power of 516.6 nm by exploiting the steep gradient of the evanescent field. Theoretically, we have explored the spontaneous emission and energy shifts of a Rydberg Rb atom close to an optical nanofibre.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
The work is progressing as planned. There were some slight delays in FY2020 due to difficulty having a postdoc entering Japan with border closures. However, in December 2020 he entered and we are now doing a major upgrade to the experiment to prepare for the next set of measurements.
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| 今後の研究の推進方策 |
In the next phase, we are exploring alternative excitation strategies for the Rydberg atoms and placing more emphasis on the controlled positioning of atoms relative to the distance from the nanofibre surface. This will allow us to fully explore the blockade regime and the influence of the dielectric surface on this phenomenon.
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| 次年度使用額が生じた理由 |
Due to the fact that the borders were closed, the planned student researcher who was coming from the USA was unable to visit and spend 6 months working on the project. Additionally, due to delays in postdoctoral researcher Dr Dylan Brown entering Japan, there were subsequent delays to the upgrade of the experiment. Finally, with no travel, we had no conference costs associated with the project.
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