2021 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 – 2023-03-31
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| Keywords | Rydberg atoms / Casimir-Polder / Rubidium / Optical Nanofiber / Quantum / Network / Atomic Physics |
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| Outline of Annual Research Achievements |
Experimentally, we developed a method to continuously frequency shift a target laser that was frequency stabilized by a reference laser, which was several hundreds of nanometers detuned. We demonstrated the technique using the 5S 1/2 → 5P 3/2 → 29D 5/2 Rydberg transition in 87 Rb vapor and locked the 482 nm target laser to the 780 nm reference laser using the cascaded electromagnetically induced transparency signal. The stabilized frequency of the target laser can be shifted by about 1.6 GHz by phase modulating the reference laser using a waveguide-type electro-optical modulator. This simple method for stable frequency shifting can be used in atomic or molecular physics experiments that require a laser frequency scanning range on the order of several GHz.
Theoretically, we studied the trapping of a ground-state cesium atom in a small region around the midpoint between two coupled identical parallel optical nanofibers. We proposed using a blue-detuned guided light field to produce an optical potential with a local minimum of exactly zero at the midpoint between the nanofibers. We find that the effects of the van der Waals potential on the total trapping potential around the minimum point were not significant when the fiber separation distance and the power of the guided light field were large.
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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 delays due to COVID restrictions, but we are now making full progress on studying n-level behaviour next to an optical nanofibre.
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| Strategy for Future Research Activity |
The future work is to finalise the studies in relation to n-level excitation of Rydberg atoms next to optical nanofibres. We have studied for S and D transitions and are currently developing a theory model with our collaborators to explain the observed phenomena. Once completed, we will proceed to developing a dipole trapping mechanism for Rydberg atoms.
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| Causes of Carryover |
Due to some COVID related research and lab access delays.
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