Yoshihisa Yamamoto (scientist)


Yoshihisa Yamamoto (山本 喜久, Yamamoto Yoshihisa) is the director of Physics & Informatics Laboratories (PHI Labs), NTT Research, Inc. He is also Professor (Emeritus) at Stanford University and National Institute of Informatics (Tokyo).

Yoshihisa Yamamoto
Photo Yoshihisa Yamamoto 2020.jpg
BornNovember 21, 1950 (1950-11-21) (age 71)
Tokyo, Japan
Alma materTokyo Institute of Technology
University of Tokyo
Known forCoherent optical communications;[1][2] Quantum-dot single-photon sources;[3][4] Differential phase-shift quantum key distribution;[3][4] Optical control of quantum-dot spin qubits;[5][6] BEC of exciton-polaritons;[7][8] Coherent Ising machines;[9]
AwardsWillis Lamb Award (2022).[10]
Okawa Prize (2011).[11]
Medal of Honor with Purple Ribbon (2005).[12]
IEEE LEOS Quantum Electronics Award (2000).[13]
Matsuo Science Prize (2000).
Nishina Prize (1992).[14]
Carl Zeiss Award (1992).[15]
Scientific career
Doctoral advisorsHisayoshi Yanai
Takeshi Kamiya
Other academic advisorsYasuharu Suematsu
  • Former Ph. D. students
    Isaac Chuang (MIT)
    Hui Cao (Yale)
    Stanley Pau (Arizona)
    Jungsang Kim (Duke)
    Robert Liu (Emory)
    Orly Alter (Utah)
    William Oliver (MIT)
    Debbie Leung (Waterloo)
    Kai-Mei Fu (Washington)
    Eleni Diamanti (Pierre-Marie Curie)
    Hui Deng (Michigan)
    Edo Waks (Maryland)
    Na Young Kim (Waterloo)
    Shruti Puri (Yale)
    Peter McMahon (Cornell)
    Matthew Pelton (UMBC)
    Neil Na (NTHU)
    Thaddeus Ladd (HRL)
    Nathan Cody Jones (HRL)
    Susan Clark (SNL)
    Charles Santori (Verily)
    David Fattal (Leia)
    Zhe Wang (Oracle)
    Kristiaan DeGreve (Imec)
    Anne Verhulst (Imec)
    Robin Huang (Teradiode)
  • Former post-doc fellows
    Gunnar Björk (KTH)
    Ataç İmamoğlu (ETH)
    Joseph Jacobson (MIT)
    Jelena Vučković (Stanford)
    Oliver Benson (Berlin)
    Gregor Weihs (Innsbruck)
    Stephan Götzinger (Max-Planck)
    Kaoru Sanaka (Tokyo University of Science)
    Alireza Marandi (Caltech)
    Qiang Zhang (USTC)
  • Citations:54578 (Google Scholar 2021)
  • h-index :118 (Google Scholar 2021)


Yamamoto was born in Tokyo on November 21, 1950. In 1973 he received his B.S. degree from Tokyo Institute of Technology. He continued his studies at the University of Tokyo where he received his M.S. in 1975 and Ph.D. in 1978. From 1978 to 1992, he worked at NTT Basic Research Laboratories in Tokyo. Since 1992, he has been a professor of applied physics and electrical engineering at Stanford University in the United States and currently a professor (emeritus). Since 2003, he also has been a professor at National Institute of Informatics in Tokyo and currently a professor (emeritus). In 2019, he became a founding director of NTT PHI Labs in Silicon Valley, California, the United States.


Yamamoto's scientific focuses in the 1980s were coherent optical fiber communications,[1] optical amplifier repeater systems,[2] photon number squeezing in semiconductor lasers, quantum non-demolition (QND) measurements,[16] and other experimental and theoretical quantum optics subjects. Some of Yamamoto's key works from this era are proposals for how to physically realize photon-number squeezing,[17] QND measurement,[18] and a gate model quantum computer using single atoms and photons.[19] His most prominent work in the 1990s is in semiconductor cavity quantum electrodynamics[20] (especially involving microcavities and quantum wells) and quantum transport effects in mesoscopic devices.[21]

During the 2000s, his most important work was on the development of optically-active quantum dots as a platform for quantum information processing (both as single-photon sources [1][2] and as hosts for spin qubits.[5][6]) Another important work was on exciton-polariton condensation effects.[7][8] Yamamoto was also active in the development of security theory and realization of quantum key distribution protocols.[3][4] Landmark papers from this era include the demonstration of indistinguishable photons from a single quantum dot;[1] the proposal for biexciton cascade emission as a method for generating entangled photons from a single quantum dot [2] (this is the proposal underlying essentially all QD entangled-photon sources, such as those reviewed in [22]), and control of a single spin qubit in a quantum dot using optical pulses.[5]

During the 2010s, his work has continued on exploring quantum dots as a platform for building both quantum repeaters and quantum computers. One highlight was the co-first demonstration (with Ataç İmamoğlu's group at ETH) of entanglement between a spin in a quantum dot and a photon emitted by it.[6] Work on exciton-polaritons continued. Since 2012, Yamamoto has studied the required number of physical qubits and expected computational time in a gate-model fault-tolerant quantum computer [23] and pioneered the development of a novel quantum/classical hybrid computer, called coherent Ising machine [9] inspired by developments in digital coherent optical communications and degenerate optical parametric oscillators.


Yamamoto is a fellow of the Optical Society of America (now Optica), the American Physical Society, and the Japan Society of Applied Physics. In 1985, Yamamoto received the Achievement Award of the Institute of Electronics, Information and Communication Engineers (IEICE) of Japan on his early work on coherent optical communications. In 1992, he received the Nishina Prize[14] and the Carl Zeiss Award[15] on his pioneering work on squeezed state generation in semiconductor lasers. In 2000, he received the IEEE LEOS Quantum Electronics Award[13] and the Matsuo Science Prize. In 2005, he received the Medal of Honour with Purple Ribbon from the Government of Japan.[12] In 2010, he was the Hermann Anton Haus Lecturer at MIT [24] and gave a lecture on exciton-polariton condensation. In 2011, he received the Okawa Prize [11] on his pioneering work on single photon generation from a quantum dot. In 2022, he received the Willis Lamb Award [10] on his pioneering work on coherent Ising machines.


  1. ^ a b c d Santori, C; Fattal, D; Vučković, J; Solomon, G S; Yamamoto, Y (2002). "Indistinguishable photons from a single-photon device". Nature. 419 (6907): 594–7. doi:10.1038/nature01086. PMID 12374958. S2CID 205209539.
  2. ^ a b c d Benson, O; Santori, C; Pelton, M; Yamamoto, Y (2000). "Regulated and entangled photons from a single quantum dot". Phys. Rev. Lett. 84 (11): 2513–6. Bibcode:2000PhRvL..84.2513B. doi:10.1103/PhysRevLett.84.2513. PMID 11018923.
  3. ^ a b c Inoue, K; Waks, E; Yamamoto, Y (2002). "Differential phase shift quantum key distribution". Phys. Rev. Lett. 89 (3): 037902. Bibcode:2002PhRvL..89c7902I. doi:10.1103/PhysRevLett.89.037902. PMID 12144419.
  4. ^ a b c Takesue, H; Nam, S W; Zhang, Q; Hadfield, R H; Honjo, T; Tamaki, K; Yamamoto, Y (2007). "Quantum key distribution over a 40-dB channel loss using superconducting single-photon detectors". Nature Photonics. 1 (6): 343. arXiv:0706.0397. Bibcode:2007NaPho...1..343T. doi:10.1038/nphoton.2007.75. S2CID 59491750.
  5. ^ a b c Press, D; Ladd, T D; Zhang, B; Yamamoto, Y (2008). "Complete quantum control of a single quantum dot spin using ultrafast optical pulses". Nature. 456 (7219): 218–21. Bibcode:2008Natur.456..218P. doi:10.1038/nature07530. PMID 19005550. S2CID 4388345.
  6. ^ a b c De Greve, K; Yu, L; McMahon, P L; Pelc, J S; Natarajan, C M; Kim, N Y; Abe, E; Maier, S; Schneider, C; Kamp, M; Hofling, S; Hadfield, R H; Forchel, A; Fejer, M M; Yamamoto, Y (2012). "Qauntum-dot spin-photon entanglement via frequency downconversion to telecom wavelength". Nature. 491 (7424): 421–5. Bibcode:2012Natur.491..421D. doi:10.1038/nature11577. PMID 23151585. S2CID 4316913.
  7. ^ a b Deng, H; Weihs, G; Santori, C; Bloch, J; Yamamoto, Y (2002). "Condensation of semiconductor microcavity exciton polaritons". Science. 298 (5591): 199–202. Bibcode:2002Sci...298..199D. doi:10.1126/science.1074464. PMID 12364801. S2CID 21366048.
  8. ^ a b Deng, H; Haug, H; Yamamoto, Y (2010). "Exciton-polariton Bose-Einstein condensation". Rev. Mod. Phys. 82 (2): 1489. Bibcode:2010RvMP...82.1489D. doi:10.1103/RevModPhys.82.1489.
  9. ^ a b McMahon, Peter L.; Marandi, Alireza; Haribara, Yoshitaka; Hamerly, Ryan; Langrock, Carsten; Tamate, Shuhei; Inagaki, Takahiro; Takesue, Hiroki; Utsunomiya, Shoko; Aihara, Kazuyuki; Byer, Robert L.; Fejer, M. M.; Mabuchi, Hideo; Yamamoto, Yoshihisa (2016). "A fully programmable 100-spin coherent Ising machine with all-to-all connections" (PDF). Science. 354 (6312): 614–617. Bibcode:2016Sci...354..614M. doi:10.1126/science.aah5178. PMID 27811274. S2CID 7550332.
  10. ^ a b Willis Lamb Award. "The 2022 Winners". The Willis E. Lamb Award for Laser Science and Quantum Optics.
  11. ^ a b The Okawa Prize. "The 2010 Okawa Prize Winner". The Okawa Foundation.
  12. ^ a b Orenstein, David. "Japanese emperor bestows Medal with Purple Ribbon on Professor Yamamoto". Stanford News. Retrieved 2005-11-21.
  13. ^ a b IEEE LEOS Quantum Electronics Award. https://www.photonicssociety.org/awards/quantum-electronics-award/quantum-electronics-award-award-winners
  14. ^ a b Nishina Memorial Foundation: Recipients of Nishina Memorial Prizes. https://www.nishina-mf.or.jp/project_en/kinen_en/
  15. ^ a b Carl Zeiss Foundation: Recipients of Carl Zeiss Research Award. https://www.zeiss.com/corporate/int/innovation-and-technology/zeiss-research-award.html.
  16. ^ Orly Alter and Yoshihisa Yamamoto (2001). Quantum Measurement of a Single System. New York, NY: Wiley. doi:10.1002/9783527617128.
  17. ^ Yamamoto, Y; Machida, S; Nilsson, O (1986). "Amplitude squeezing in a pump-noise-suppressed laser oscillator". Phys. Rev. A. 34 (5): 4025–4042. Bibcode:1986PhRvA..34.4025Y. doi:10.1103/PhysRevA.34.4025. PMID 9897747.;Machida, S; Yamamoto, Y; Itaya, Y (1987). "Observation of amplitude squeezing in a constant-current–driven semiconductor laser". Phys. Rev. Lett. 58 (10): 1000–1003. Bibcode:1987PhRvL..58.1000M. doi:10.1103/PhysRevLett.58.1000. PMID 10034306.
  18. ^ Imoto, N; Haus, H. A; Yamamoto, Y (1985). "Quantum nondemolition measurement of the photon number via the optical Kerr effect". Phys. Rev. A. 32 (4): 2287–2292. Bibcode:1985PhRvA..32.2287I. doi:10.1103/PhysRevA.32.2287. PMID 9896342.; Drummond, P. D.; Shelby, R. M.; Friberg, S. R.; Yamamoto, Y (1993). "Quantum solitons in optical fibres". Nature. 365: 307–313.
  19. ^ Igeta, K; Yamamoto, Y (1988). "Quantum mechanical computers with single atom and photon fields". International Quantum Electronics Conference.; Chuang, I; Yamamoto, Y (1995). "Simple quantum computer". Phys. Rev. A. 52: 3489–3496.
  20. ^ Yamamoto, Y; Imamoglu, A (1999). Mesoscopic Quantum Optics. Wiley-Interscience. ISBN 0471148741.
  21. ^ Oliver, W D; Kim, J; Liu, R C; Yamamoto, Y (1999). "Hanbury Brown and Twiss-type experiment with electrons". Science. 284 (5412): 299–301. Bibcode:1999Sci...284..299O. doi:10.1126/science.284.5412.299. PMID 10195891.
  22. ^ Shields Andrew J (2007). "Semiconductor quantum light sources". Nature Photonics. 1 (4): 215–223. arXiv:0704.0403. Bibcode:2007NaPho...1..215S. doi:10.1038/nphoton.2007.46. S2CID 119664751.
  23. ^ Jones, N C; Van Meter, R; Fowler, A G; McMahon, P L; Kim, J; Ladd, T; Yamamoto, Y (2012). "Layered architecture for quantum computing". Phys. Rev. X. 2 (3): 031007. arXiv:1010.5022. Bibcode:2012PhRvX...2c1007J. doi:10.1103/PhysRevX.2.031007. S2CID 17197330.
  24. ^ The Hermann Anton Haus Fund. "Yoshihisa Yamamoto to deliver the 2010 Hermann Anton Haus Lecture". RLE News Articles. MIT.

External linksEdit

  • Yamamoto page at Stanford https://yoshihisayamamoto.sites.stanford.edu/
  • Yamamoto page at NTT Research, Inc. https://ntt-research.com/phi/