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Quantum Information Science Using Photons
S. Takeuchi
AAPPS Bulletin 24(1), 19 (2014)

Anomaly detection in reconstructed quantum states using a machine-learning technique
S. Hara, T. Ono, R. Okamoto, T. Washio, S. Takeuchi
Phys. Rev. A 89, 022104 (2014)

Recent progress in single-photon and entangled-photon generation and applications
S. Takeuchi
JJAP, vol. 53, 030101 (2014)

Observation of 1.2-GHz linewidth of zero-phonon-line in photoluminescence spectra of nitrogen vacancy centers in nanodiamonds using a Fabry-Perot
H.-Q. Zhao, M. Fujiwara, M. Okano, S. Takeuchi
Opt. Express 21(24), 29679 (2013)

Investigation of the Performance of an Ultralow-Dark-Count Superconducting Nanowire Single-Photon Detector
S. Subashchandran, R. Okamoto, L. Zhang, A. Tanaka, M. Okano, L. Kang, J. Chen, P. Wu, S. Takeuchi
JJAP, vol. 52, 102801 (2013)

An Entanglement-Enhanced Microscope
T. Ono, R. Okamoto, S. Takeuchi
Nature Communications, 4:2426, 3426 (2013)

Dispersion cancellation in high-resolution two-photon interference
M. Okano, R. Okamoto, A. Tanaka, S. Ishida, N. Nishizawa, S. Takeuchi
Phys. Rev. A 88, 043845 (2013)

Noncollinear parametric fluorescence by chirped quasi-phase matching for monocycle temporal entanglement
A. Tanaka, R. Okamoto, H.H. Lim, S. Subashchandran, M. Okano, L. Zhang, L. Kang, J. Chen, P. Wu, T. Hirohata, S. Kurimura, S. Takeuchi
Opt.Exp., 20, 23, 25228 (2012)

Experimental demonstration of adaptive quantum state estimation
R. Okamoto, M. Iefuji, S. Oyama, K. Yamagata, H. Imai, A. Fujiwara, S. Takeuchi
Phys. Rev. Lett., 109, 13, 130404 (2012)

Effect of substrates on the temperature dependence of fluorescence spectra of nitrogen vacancy centers in diamond nanocrystals
H.Q. Zhao, M. Fujiwara, S. Takeuchi
Jpn. J. Appl. Phys., 51, 9, 090110 (2012)

Coupling of ultrathin tapered fibers with high-Q microsphere resonators at cryogenic temperatures and observation of phase-shift transition from undercoupling to overcoupling
M. Fujiwara, T. Noda, A. Tanaka, K. Toubaru, H.Q. Zhao, S. Takeuchi
Optics Express, 20, 17, 19545 (2012)

Suppression of fluorescence phonon sideband from nitrogen vacancy centers in diamond nanocrystals by substrate effect
H.Q. Zhao, M. Fujiwara, S. Takeuchi
Optics Express, 20, 14, 15628 (2012)

Highly indistinguishable heralded single-photon sources using parametric down conversion
M. Tanida, R. Okamoto, S. Takeuchi
Optics Express, 20, 14, 15275 (2012)

Generation of broadband spontaneous parametric fluorescence using multiple bulk nonlinear crystals
M. Okano, R. Okamoto, A. Tanaka, S. Subashchandran, S. Takeuchi
Optics Express, 20, 13, 13977 (2012)

A nanodiamond - tapered fiber system with high single-mode coupling efficiency as key element for integrated quantum technology and nanophotonics
T. Schröder, M. Fujiwara, T. Noda, H.Q. Zhao, O. Benson, S. Takeuchi
Optics Express, 20, 10, 10490 (2012)

Detection of superposition in the orbital angular momentum of photons without excess components and its application in the verification of non-classical correlation
Y. Miyamoto, D. Kawase, M. Takeda, K. Sasaki, S. Takeuchi
Journal of Optics, vol.13, No.6 (2011)

Highly Efficient Coupling of Photons from Nanoemitters into Single-Mode Optical Fibers
M. Fujiwara, K. Toubaru, T. Noda, H.Q. Zhao, S. Takeuchi
Nano Letters, 11, 10, 4362 (2011)

Realization of a Knill-Laflame -Milburn controlled-NOT photonic quantum circuit combining effective optical nonlinearities
R. Okamoto, J.L. O'Brien, H.F. Hofmann, S. Takeuchi
Proceedings of the National Academy of Sciences, 108, 25, 10067 (2011)

Optical transmittance degradation in tapered fibers
M. Fujiwara, K. Toubaru, S. Takeuchi
OOptics Express, 19, 9, 8596 (2011)

Phase shift spectra of a fiber-microsphere system at the single photon level
A. Tanaka, T. Asai, K. Toubaru, H. Takashima, M. Fujiwara, R. Okamoto, S. Takeuchi
Optics Express, 19, 3, 2278 (2011)

Analysis of experimental error sources in a linear-optics quantum gate
T. Nagata, R. Okamoto, H F. Hofmann, S. Takeuchi
New J. of Phys., 12, 43053 (2010)

Fiber-microsphere system at cryogenic temperatures toward cavity QED using diamond NV center
H. Takashima, T. Asai, K. Toubaru, M. Fujiwara, K. Sasaki, S. Takeuchi
Optics Express, 18, 14, 15169 (2010)