2015 Fiscal Year Research-status 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 | Quantum information / Nanophotonics / Quantum emitters / Nanoparticles |
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| Outline of Annual Research Achievements |
研究の目的 In this research, we propose to control a quantum bit (qubit) in the form of a single “atom” which is attached to a nanofiber. The “atom” takes the form of a nanocrystal of diamond with a defect which provides two levels which can be used as a quantum bit.
研究実施計画 This experiment requires technologies for i) the manufacture of optical nanofibers, ii) the ability to introduce single nanoparticles onto the surface of the nanofiber, iii) the ability to coherently manipulate the state of the nanoparticle (“atom”) on the nanofiber and iv) enhancement of the coupling of light from the nanoparticle to the nanofiber to increase efficiency of the device.
研究の実績 In the last year, we made progress on steps i) ii) and iv) above and also presented our results at conferences.Specific achievements include: * Construction of a new nanofiber manufacturing apparatus, * Introduction of nanoparticles to the nanofiber surface, * Measurement of polarization dependence of scattering into the nanofiber from nanoparticles (chirality), * Nano-fabrication of gratings for use with NV centers (at CPI, UEC), * Development of a new method to measure nanofiber diameter.
Additionally, the following equipment has been prepared: * NV centers in nanodiamond have been purchased, and deposition on a nanofiber has been tested (at CPI, UEC)
* An antenna for irradiating the nanofiber with microwaves has been purchased.
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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
My movement from UEC to a new post at Tohoku University has resulted in a number of changes to my research plans and the facilities available to me. In particular, it was necessary to build a completely new nanofiber manufacturing machine, which I did in the last year with help from a student. It was also necessary to acquire the necessary materials and equipment to perform deposition and optical interrogation of nanoparticles on the nanofiber surface. This was also achieved in the past year. Additionally, I also started to build a laser cooling experiment in the last year as required for my new position.
The above factors mean that progress has been slower than expected, but the project is still mostly on schedule with regard to the goals for FY2015. Additionally, interesting new possibilities for the experiment have been opened, by our experiments on introducing nanoparticles to the nanofiber surface. I hope that this may lead to new ways to achieve the goals of this project.
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| Strategy for Future Research Activity |
In the last year, we established a reliable nanofiber manufacturing apparatus. We also performed our first experiments introducing nanoparticles to the nanofiber surface as is necessary for the current project. Using these basic techniques, we now plan to move ahead to do new research.
First, in order to perfect our knowledge of deposition of nanoparticles, and explore new possibilities of enhancement of coupling to the nanofiber guided modes, we will perform experiments with gold nanoparticles. These nanoparticles are larger than nanodiamonds and are therefore easier to detect and measure. Knowledge of the distribution of these particles on the nanofiber surface should help us to predict the distribution of nanodiamonds on the nanofiber, which would be useful for the current research project.
Gold nanoparticles also have other advantages including enhancement of spontaneous emission and the possibility of control of emission direction into the nanofiber (so-called chiral waveguides) which may be very important for future quantum networks. For this reason, we plan to study the system of nanofibers and gold nanoparticles in more detail in the first half of FY2016.
In the second half of FY2016, we plan to move to quantum emitters including nanodiamond based emitters as in the original plan for this research. By combining quantum emitters and gold nanoparticles, we hope to enhance coupling to the nanofiber and therefore make an important step towards a quibit efficiently coupled to a nanofiber.
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[Presentation] Cavity QED on a nanofiber2015
Author(s)
M. Sadgrove, R. Yalla, K. P. Nayak, K. Hakuta
Organizer
MIT - Tohoku University Research Exchange Symposium,
Place of Presentation
Massachusetts Institute of Technology (U.S.A.)
Year and Date
2015-07-01 – 2015-07-03
Int'l Joint Research
