2015 Fiscal Year Research-status Report
Development of quantum discrete frequency combs techniques
| Project/Area Number |
15K17477
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| Research Institution | National Institute of Information and Communications Technology |
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Principal Investigator |
金 鋭博 国立研究開発法人情報通信研究機構, 未来ICT研究所・量子ICT研究室, 研究員 (40647484)
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| Project Period (FY) |
2015-04-01 – 2017-03-31
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| Keywords | entangled qudits / spectrally resolved / quantum interference |
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| Outline of Annual Research Achievements |
In Fiscal Year 2015, we have made two important progress on this project.
(1) We have generated the multi-mode entangled state in experiment. The multi-mode entangled state has a comb structure, which is a qudit state in frequency-domain. The results were summarized in paper which has been posted on arXiv:1603.07887 and also submitted to a journal. The title of our paper is: Generation and distribution of high-dimensional frequency-entangled qudits. In this work, we demonstrate a novel scheme to generate frequency-entangled qudits with dimension number higher than 10 and to distribute them over optical fibers of 15 km in total length. This scheme combines the technique of spectral engineering of biphotons generated by spontaneous parametric down-conversion and the technique of spectrally resolved Hong-Ou-Mandel interference. We characterized the comb-like spectral correlation structures of the qudits by time of arrival measurement and correlated spectral intensity measurement. The generation and distribution of the distinct entangled frequency modes may be useful for quantum cryptography, quantum metrology, quantum remote synchronization, as well as fundamental test of stronger violation of local realism.
(2) Using the similar technique, we demonstrated a spectrally resolved Hong-Ou-Mandel interference between independent sources. This result was published on Optics Express Vol. 23, pp. 28836-28848 (2015).
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
We have basically finished the main task of our original plan. In Fiscal Year 2015, we have already constructed the fiber spectrometer. Also, we measured the spectrally resolved HOMI with fiber spectrometer, and compared it with the theoretical simulation. We have summarized our results in two papers:"Spectrally resolved Hong-Ou-Mandel interference between independent sources" and "Generation and distribution of high-dimensional frequency-entangled qudits".
We need to emphasize that we used the name of "quantum discrete frequency combs" in our initial plan, but later we find "high-dimensional frequency-entangled qudits" is a more proper name. Therefore, we adopted the name of "qudits" in our recent papers.
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| Strategy for Future Research Activity |
In Fiscal Year 2016, we will expand our research to the Fourier transformation in time domain and frequency domain using our frequency entangled state, as planed in our initial scheme.
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| Causes of Carryover |
I need to buy some devices in next Fiscal Year
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| Expenditure Plan for Carryover Budget |
The budget will be used to buy optical devices.
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[Presentation] Spectrally resolved nonclassical interference between independent sources2016
Author(s)
Rui-Bo Jin, Thomas Gerrits, Mikio Fujiwara, Ryota Wakabayashi, Taro Yamashita, Shigehito Miki, Hirotaka Terai, Ryosuke Shimizu, Masahiro Takeoka, Masahide Sasaki
Organizer
The 63th Japanese Society of Applied Physics Spring Meeting (JSAP63)
Place of Presentation
Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8550 JAPAN
Year and Date
2016-03-20 – 2016-03-20
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[Presentation] Spectrally resolved nonclassical interference between independent sources2015
Author(s)
Rui-Bo Jin, Thomas Gerrits, Mikio Fujiwara, Ryota Wakabayashi, Taro Yamashita, Shigehito Miki, Hirotaka Terai, Ryosuke Shimizu, Masahiro Takeoka, Masahide Sasaki
Organizer
Single Photon Workshop 2015
Place of Presentation
University of Geneva, Geneva, Switzerland
Year and Date
2015-07-14 – 2015-07-14
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[Presentation] Efficient generation of twin photons at telecom wavelengths with 10 GHz repetition-rate tunable comb laser2015
Author(s)
Rui-Bo Jin, Ryosuke Shimizu, Isao Morohashi, Kentaro Wakui, Masahiro Takeoka, Shuro Izumi, Takahide Sakamoto, Mikio Fujiwara, Taro Yamashita, Shigehito Miki, Hirotaka Terai, Zhen Wang, Masahide Sasaki
Organizer
The Conference on Lasers and Electro-Optics (CLEO2015)
Place of Presentation
San Jose McEnery Convention Center, San Jose, California, USA
Year and Date
2015-05-11 – 2015-05-11
Int'l Joint Research
