2020 Fiscal Year Research-status Report
光ナノファイバデータバスを用いたリドベルグ原子の量子ネットワーク
| Project/Area Number |
19K05316
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| Research Institution | Okinawa Institute of Science and Technology Graduate University |
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Principal Investigator |
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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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | cold atoms / optical nanofibre / Rydberg / evanescent field / spin selection / dipole trap |
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| Outline of Annual Research Achievements |
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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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
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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| Strategy for Future Research Activity |
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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| Causes of Carryover |
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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