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  1. Monotonic quantum-to-classical transition enabled by positively correlated biphotons.
    Rui-Bo Jin, Guo-Qun Chen, Hui Jing, Changliang Ren, Pei Zhao, Ryosuke Shimizu, and Pei-Xiang Lu,
    Phys. Rev. A 95, 062341/1-8 (2017).
  2. Simple method of generating and distributing frequency-entangled qudits.
    Rui-Bo Jin, Ryosuke Shimizu, Mikio Fujiwara, Masahiro Takeoka, Ryota Wakabayashi, Taro Yamashita, Shigehito Miki, Hirotaka Terai, Thomas Gerrits, and Masahide Sasaki,
    Quantum Sci. Technol. 1, 015004/1-9 (2016).
  3. Detection-dependent six-photon Holland-Burnett state interference.
    Rui-Bo Jin, Mikio Fujiwara, Ryosuke Shimizu, Robert J. Collins, Gerald S. Buller, Taro Yamashita, Shigehito Miki, Hirotaka Terai, Masahiro Takeoka, and Masahide Sasaki,
    Sci. Rep. 6, 36914/1-7 (2016).
  4. Free-space optical channel estimation for physical layer security.
    Hiroyuki Endo, Mikio Fujiwara, Mitsuo Kitamura, Toshiyuki Ito, Morio Toyoshima, Yoshihisa Takayama, Hideki Takenaka, Ryosuke Shimizu, Nicola Laurenti, Giuseppe Vallone, Paolo Villoresi, Takao Aoki, and Masahide Sasaki,
    Opt. Express 24 (8), 8490-8955 (2016).
  5. Spectrally resolved Hong-Ou-Mandel interference between independent photon sources.
    Rui-Bo Jin, Thomas Gerrits, Mikio Fujiwara, Ryota Wakabayashi, Taro Yamashita, Shigehito Miki, Hirotaka Terai, Ryosuke Shimizu, Masahiro Takeoka, and Masahide Sasaki,
    Opt. Express 23 (22), 28836-28848 (2015).
  6. Highly efficient entanglement swapping and teleportation at telecom wavelength.
    Rui-bo Jin, Masahiro Takeoka, Utako Takagi, Ryosuke Shimizu, and Masahide Sasaki,
    Sci. Rep. 5, 9333/1-7 (2015).
  7. Spectral properties of broadband biphotons generated from PPMgSLT under a type-II phase-matching condition.
    Nandan Singh Bisht and Ryosuke Shimizu,
    J. Opt. Soc. Am. B 32 (4), 550-554 (2015).
    (Highlighted in UEC e-Bulletin)
  8. Efficient detection of an ultra-bright single-photon source using superconducting nanowire single-photon detectors.
    Rui-Bo Jin, Mikio Fujiwara, Taro Yamashita, Shigehito Miki, Hirotaka Terai, Zhen Wang, Kentaro Wakui, Ryosuke Shimizu, and Masahide Sasaki,
    Opt. Comm. 336, 47-54 (2015).
  9. Efficient generation of twin photons at telecom wavelengths with 2.5 GHz repetition-rate-tunable comb laser.
    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, and Masahide Sasaki,
    Sci. Rep. 4, 7468/1-6 (2014).
  10. Pulsed Sagnac polarization-entangled photon source with a PPKTP crystal at telecom wavelength.
    Rui-Bo Jin, Ryosuke Shimizu, Kentaro Wakui, Mikio Fujiwara, Taro Yamashita, Shigehito Miki, Hirotaka Terai, Zhen Wang, and Masahide Sasaki,
    Opt. Express 22 (10), 11498-11507 (2014).
  11. Entangled-state generation with an intrinsically pure single-photon source and a weak coherent source.
    Rui-Bo Jin, Ryosuke Shimizu, Fumihiro Kaneda, Yasuyoshi Mitsumori, Hideo Kosaka, and Keiichi Edamatsu,
    Phys. Rev. A 88, 012324/1-4 (2013).
  12. Nonclasscial interference between independent intrinsically pure single photons at telecom wavelength.
    Rui-Bo Jin, Kentaro Wakui, Ryosuke Shimizu, Hugo Benichi, Shigehito Miki, Taro Yamashita, Hirotaka Terai, Zhen Wang, Mikio Fujiwara, and Masahide Sasaki,
    Phys. Rev. A 87, 063801/1-4 (2013).
  13. Widely tunable single photon source with high purity at telecom wavelength.
    Rui-Bo Jin, Ryosuke Shimizu, Kentaro Wakui, Hugo Benichi, and Masahide Sasaki,
    Opt. Express 21 (9), 10659-10666 (2013).
    (Selected for publication in the Virtual Journal for Biomedical Optics)
  14. Experimental Activation of Bound Entanglement.
    Fumihiro Kaneda, Ryosuke Shimizu, Satoshi Ishizaka, Yasuyoshi Mitsumori, Hideo Kosaka, and Keiichi Edamatsu,
    Phys. Rev. Lett. 109, 040501/1-4 (2012).
  15. Four-photon quantum interferometry at a telecom wavelength.
    Masahiro Yabuno, Ryosuke Shimizu, Yasuyoshi Mitsumori, Hideo Kosaka, and Keiichi Edamatsu,
    Phys. Rev. A 86, 010302(R)/1-4 (2012).
  16. Entangled photon generation in two-period quasi-phase-matched parametric down-conversion.
    Wakana Ueno, Fumihiro Kaneda, Hirofumi Suzuki, Shigehiro Nagano, Atsushi Syouji, Ryosuke Shimizu, Koji Suizu, and Keiichi Edamatsu,
    Opt. Express 20 (5), 5508-5517 (2012).
  17. High-visibility nonclassical interference between intrinsically pure heralded single photons and photons from a weak coherent field.
    Rui-Bo Jin, Jun Zhang, Ryosuke Shimizu, Nobuyuki Matsuda, Yasuyoshi Mitsumori, Hideo Kosaka, and Keiichi Eamatsu,
    Phys. Rev. A 83, 031805(R)/1-4  (2011).
  18. Up-conversion dynamics for temporally entangled two-photon pulses.
    Masatoshi Nakatani, Ryosuke Shimizu, and Kazuki Koshino,
    Phys. Rev. A 83, 013824/1-6 (2011).
  19. Efficient up-conversion detection of 1550 nm photons using bulk periodically-poled LiNbO3.
    Atsushi Syouji, Shigehiro Nagano, Ryosuke Shimizu, Koji Suizu, and Keiichi Edamatsu,
    Jpn. J. Appl. Phys. 49, 040213/1-3 (2010).
  20. All-optical phase modulations in a silicon wire waveguide at ultra-low light levels.
    Nobuyuki Matsuda, Ryosuke Shimizu, Yasuyoshi Mitsumori, Hideo Kosaka, Aya Sato, Hiroyuki Yokoyama, Koji Yamada, Toshifumi Watanabe, Tai Tsuchizawa, Hiroshi Fukuda, Seiichi Itabashi, and Keiichi Edamatsu,
    Appl. Phys. Lett. 95, 171110/1-3 (2009).
  21. High-flux and broadband biphoton sources with controlled frequency entanglement.
    Ryosuke Shimizu and Keiichi Edamatsu,
    Opt. Express 17 (19), 16385-16393 (2009).
  22. Generation of cross-polarized photon pairs via type-II third-order quasi-phase matched parametric down-conversion.
    Shigehiro Nagano, Atsushi Syouji, Ryosuke Shimizu, Koji Suizu, Hiromasa Ito, and Keiichi Edamatsu,
    Jpn. J. Appl. Phys. 48, 050205/1-3 (2009).
  23. Multimode theory of up-conversion of two photons.
    Masatoshi Nakatani, Ryosuke Shimizu, and Kazuki Koshino,
    J. Phys. Soc. Jpn. 78, 054401/1-7 (2009).
  24. Observation of optical-fibre Kerr nonlinearity at the single-photon level.
    Nobuyuki Matsuda, Ryosuke Shimizu, Yasuyoshi Mitsumori, Hideo Kosaka, and Keiichi Edamatsu,
    Nat. Photon. 3, 95-98 (2009).
  25. Generation of polarization entanglement from spatially correlated photons in spontaneous parametric down-conversion.
    Ryosuke Shimizu, Takashi Yamaguchi, Yasuyoshi Mitsumori, Hideo Kosaka, and Keiichi Edamatsu,
    Phys. Rev. A 77, 032338/1-4 (2008).
  26. 800-nm band cross-polarized photon pair source using type-II parametric down-conversion in periodically poled lithium niobate.
    Shigehiro Nagano, Ryosuke Shimizu, Yohei Sugiura, Koji Suizu, Keiichi Edamatsu, and Hiromasa Ito,
    Jpn. J. Appl. Phys. 46, L1064-L1067 (2007).
  27. Lossless all-optical phase gate using a polarization-division Sagnac interferometer applicable to a waveguide-type Kerr medium.
    Nobuyuki Matsuda, Yasuyoshi Mitsumori, Hideo Kosaka, Keiichi Edamatsu, and Ryosuke Shimizu,
    Appl. Phys. Lett. 91, 171119/1-3 (2007).
  28. Photon polarization entanglement induced by biexciton: experimental evidence for violation of Bell's inequality.
    Goro Oohata, Ryosuke Shimizu, and Keiichi Edamatsu,
    Phys. Rev. Lett. 98, 140503/1-4 (2007).
  29. Generation of ultraviolet entangled photons in a semiconductor.
    Keiichi Edamatsu, Goro Oohata, Ryosuke Shimizu, and Tadashi Itoh,
    Nature 431, 167-170 (2004).
  30. Quantum diffraction and interference of spatially correlated photon pairs generated by spontaneous parametric down-conversion.
    Ryosuke Shimizu, Keiichi Edamatsu, and Tadashi Itoh,
    Phys. Rev. A 67, 041805(R)/1-4 (2003).
  31. Measurement of the photonic de Broglie wavelength of entangled photon pairs generated by spontaneous parametric down-conversion.
    Keiichi Edamatsu, Ryosuke Shimizu, and Tadashi Itoh,
    Phys. Rev. Lett. 89, 213601/1-4 (2002).