Work with attractive nature of light quanta, Make innovation in Science and Technology.

About us

By using quantum nature of light, it is predicted that we can drastically enhance the performance of information processing (Quantum Computer), secure communication (Quantum Cryptography) and even sensing (Quantum Metrology).
We carry on experimental researches into the realization and the application of the novel states of light, by generating individual single photons and controlling the quantum correlation between these photons. Toward the perfect control of single photons, we investigate nano-scale photonic structures for optical quantum devices and single photon sources.
Using those devices, we are constructing quantum optical systems and optical quantum circuits for quantum information processing, quantum metrology and quantum lithography. Our research topic also includes the generation and characterization of entangled photons, single molecular spectroscopy, and highly efficient single photon detectors.

Topics

2021.4.1
Welcome our new members, Tuma Iwata (BC4), Yutaro Okamoto (BC4), Ryoya Saito (BC4), Kazuki Suzuki (BC4), Yushi Hamayama (BC4)
2021.3.9
Our paper is published in Optics Express. Congratulations!
Y. Mukai, M. Arahata, T. Tashima, R. Okamoto, and S. Takeuchi "Quantum Fourier-Transform Infrared Spectroscopy for Complex Transmittance Measurements" Phys. Rev. Applied 15, 034019 (2021)
2021.2.3
Our paper is published in Optics Express. Congratulations!
Z. Yin, K. Sugiura, H. Takashima, R. Okamoto, F. Qiu, S. Yokoyama, and S. Takeuchi "Frequency correlated photon generation at telecom band using silicon nitride ring cavities" Opt. Express 29, 4821-4829 (2021)
2020.12.1
Welcome Dr. Yujiro Eto to join our lab as an Associate professor.
2020.10.29
Our paper is published in New Journal of Physics. Congratulations!
T. Kiyohara, N. Yamashiro, R. Okamoto, H. Araki, J.-Y Wu, H. F. Hofmann, and S. Takeuchi "Direct and efficient verification of entanglement between two multimodemultiphoton systems" Optica 7, 1517-1523 (2020)
2020.10.12
Our paper is published in New Journal of Physics. Congratulations!
R. Okamoto, Y. Tokami, and S. Takeuchi "Loss tolerant quantum absorption measurement" New J. Phys 22, 103016 (2020)
2020.9.16
Our paper is published in Physical Review A:Rapid Communications. Congratulations!
S. Nohara, R. Okamoto, A. Fujiwara, and S. Takeuchi "Adaptive quantum state estimation for dynamic quantum states" Phys. Rev. A 102, 030401(R) (2020)
2020.7.16
Our paper is published in Applied Physics Letters. Congratulations!
H. Takashima, H. Maruya, K. Ishihara, T. Tashima, K. Shimazaki, A. W. Schell, T. T. Tran, I. Aharonovich, and S. Takeuchi "Determination of the Dipole Orientation of Single Defects in Hexagonal Boron Nitride" ACS Photonics
2020.6.29
Our paper is published in Applied Physics Letters. Congratulations!
K. Fukushige, H. Kawaguchi, K. Shimazaki, T. Tashima, H. Takashima, and S. Takeuchi "Identification of the orientation of a single NV center in a nanodiamond using a three-dimensionally controlled magnetic field" Appl. Phys. Lett. 116, 264002 (2020)
2020.6.11
Our paper is published in Applied Physics Letters. Congratulations!
K. Sugiura, Z. Yin, R. Okamoto, L. Zhang, L. Kang, J. Chen, P. Wu, S. T. Chu, B. E. Little, and S. Takeuchi "Broadband generation of photon-pairs from a CMOS compatible device" Appl. Phys. Lett. 116, 224001 (2020)
2020.5.28
Our paper is published in Optics Express. Congratulations!
T. Kiyohara, R. Okamoto, and S. Takeuchi "Unified integration scheme using an N×N active switch for efficient generation of a multi-photon parallel state" Optics Express, 28, 17490-17501 (2020)
2020.4.1
Welcome our new members, Manato Inoue (BC4), Shun Kanae (BC4), Shunsuke Sasaki (BC4), Dan Nakamura (BC4), Yusuke Yamada (BC4)
2020.4.1
Welcome Dr. Naofumi Abe to join our lab as a Post-Doctoral Fellow.
2020.4.1
Welcome Dr. Hiroshi Kagata to join our lab as a Post-Doctoral Fellow (CPIER).
2019.11.14
On 16 - 17 December 2019, EU-USA-Japan International Symposium on Quantum Technology will be held.
2019.9.16
Our paper is published in Optics Express. Congratulations!
T. Tashima, H. Takashima, and S. Takeuchi "Direct optical excitation of an NV center via a nanofiber Bragg-cavity: a theoretical simulation" Optics Express, 27, 27009-27016 (2019)
2019.8.1
Welcome Prof. Yoon-ho Kim to join our lab as a Kyoto University Guest Professor.
2019.6.17
Our paper is published in Jpn. J. Appl. Phys.. Congratulations!
S. Nohara, R. Okamoto and S. Takeuchi "Realization of high-speed adaptive quantum state estimation" Jpn. J. Appl. Phys. 58 072001 (2019)
2019.6.1
Welcome our new member (Technical Assistant)
2019.4.8
Welcome Dr. Yu Mukai to join our lab as a Post-Doctoral Fellow.
2019.4.6
We enjoyed the beautiful view of cherry-blossom in Arashiyama East Park.
2019.4.1
Welcome our new members, Geobae Pabk (MC1), Koki Kawabata (BC4), Yuki Gama (BC4), Tomoyasu Horino (BC4), Itsumu Fujita (BC4), Tomoyasu Horino (BC4)
2019.3.19
Associate Professor Ryo Okamoto recived Electronics Society Activity Testimonial. Congratulations.
2019.3.10
Takayuki Kiyohara recived Photonics Division Award from JASP for his paper Serial-parallel conversion for single photons with heralding signals. Congratulations.
2019.3.6
Associate Professor Ryo Okamoto recived FY2018 research achievement awards. Congratulations.
2019.2.23
Our paper is published in Optics Express. Congratulations!
H. Takashima, A. Fukuda, H. Maruya, T. Tashima, and S. Takeuchi "Fabrication of a nanofiber Bragg cavity with high quality factor using a focused helium ion beam" Opt. Express 27, 6792-6800 (2019)
2019.1.25
Our paper is published in Optics Express. Congratulations!
K. Sugiura, R. Okamoto, and S. Takeuchi "An on-chip photon-pair source with negligible two-photon absoprtion"Applied Physics Express 12, 022006 (2019)
2019.1.8
Our paper is published in Optics Express. Congratulations!
H. Maruya, Y. Oe, H. Takashima, A. N. Hattori, H. Tanaka, and S. Takeuchi "Non-contact detection of nanoscale structures using optical nanofiber"Optics Express 2019, 27, 367-376.
2018.5.22
Our paper is published in Scientific Reports. Congratulations!
A. C. Elitzur, E. Cohen, R. Okamoto, and S. Takeuchi "Nonlocal Position Changes of a Photon Revealed by Quantum Routers"Scientific Report 2018, 8, 7730. This work is featured in Scientific American
2017.12.26
Our paper is published in Optics Express. Congratulations!
T. Kiyohara, R. Okamoto, and S. Takeuchi "Serial-parallel conversion for single photons with heralding signals"Optics Express 2017, 25, 32443-32450. This paper is highlighted as an Editor's Pick.
2017.10.26
Our paper is published in ACS Omega. Congratulations!
M. Fujiwara, O. Neitzke, T. Schrder, A. W. Schell, J. Wolters, J. Zheng, S. Mouradian, M. Almoktar, S. Takeuchi, D. Englund, and O. Benson "Fiber-Coupled Diamond Micro-Waveguides toward an Efficient Quantum Interface for Spin Defect Centers"ACS Omega 2017, 2, 7194-7202.
2017.08.18
Our paper is published in Physical Review A. Congratulations!
R. Okamoto, S. Oyama, K. Yamagata, A. Fujiwara, S. Takeuchi"Experimental demonstration of adaptive quantum state estimation for single photonic qubits"Phys. Rev. A 96, 022124 (2017).
2017.04.08
Lab's excursion (cherry-blossom viewing at Sewarite in Kyoto)
2017.04.07
The member page is updated.
2017.04.03
Our paper is published in Scientific Report. Congratulations!
T. Ono, R. Okamoto, M. Tanida, H. F. Hofmann, S. Takeuchi"Implementation of a quantum controlled-SWAP gate with photonic circuits"Scientific Reports, 7, 45353 (2017).
2017.03.13
Our paper is published in ACS Photonics. Congratulations!
Andreas W. Schell, Hideaki Takashima, Toan Trong Tran, Igor Aharonovich, and Shigeki Takeuchi"Coupling Quantum Emitters in 2D Materials with Tapered Fibers"ACS Photonics, 2017, 4 (4), pp 761-767.
2016.11.15
Our paper is published in Optics Express. Congratulations!
T. Kiyohara, R. Okamoto, S. Takeuchi "Realization of multiplexing of heralded single photon sources using photon number resolving detectors " Optics Express, 24, 27288-27297 (2016).
2016.04.07
The member page is updated.
2015.04.07
The member page is updated.
2014.12.17
The web page is updated.
2014.11.01
Andreas Schell joins our laboratory! The member page is updated.
2014.10.01
Our laboratory moved to Kyoto University in summer.
2013.05.27
We host an international workshop in Japan ( NSTEP2013) on July 8-9th.
2013.04.03
The member page is updated.
2011.04.11
The member page is updated.
2009.03.25
We have opened our English web page!

Current Address:
Takeuchi Lab, Department of Electronic Science and Engineering, Kyoto University,
Kyoto Daigaku-Katsura, Nishikyo-ku, Kyoto, JAPAN, 615-8510
TEL:+81-(0)75-383-2286 E-Mail: takeuchi@kuee.kyoto-u.ac.jp

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