2016 Fiscal Year Annual Research Report
Coherent control of a solid state qubit on an optical nanofiber
| Project/Area Number |
15K13544
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| Research Institution | Tohoku University |
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Principal Investigator |
Sadgrove Mark 東北大学, 電気通信研究所, 准教授 (40625000)
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| Project Period (FY) |
2015-04-01 – 2017-03-31
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| Keywords | ナノフォトニクス / ナノ粒子 / 量子情報 |
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| Outline of Annual Research Achievements |
In this research, the applicant aimed to coherently interface a quantum emitter with a nano-waveguide (optical nanofiber).
The first step was the development of a new nanofiber fabrication apparatus at The Research Institute of Electrical Communications. The applicant built an apparatus to taper optical nanofibers to diameters as low as 300 nm while achieving transmissions of up to 98%. These optical nanofibers provide a method for coupling single photons from quantum emitters to standard optical fibers and therefore to optical fiber networks. Next, the applicant designed and ordered gratings which are designed to induce a cavity for the nanofiber mode. This cavity can increase coupling of a quantum emitter to the nanofiber allowing efficient coupling of quantum emitters to a fiber network. We used a similar grating structure to sensitively measure the nanofiber diameter as explained in our publication [1]. Finally, we developed methods to deposit and interface emitters with the nanofiber either by deposition of nanoparticles on the nanofiber surface (this work submitted for publication) or by interfacing cold atoms with the nanofiber cavity [2]. This will allow future coupling of solid state emitters to the nanofiber.
[1] Diameter measurement of optical nanofibers using a composite photonic crystal cavity. J Keloth, M Sadgrove, R Yalla, K Hakuta. Optics letters 40 (17), 4122-4125 (2015).
[2] Composite device for interfacing an array of atoms with a single nanophotonic cavity mode. M Sadgrove, KP Nayak. Accepted for publication, New Journal of Physics (2017).
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