Yoshihisa Yamamoto (scientist)

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Yoshihisa Yamamoto
Born November 21, 1950 (1950-11-21) (age 66)[1]
Tokyo, Japan[1]
Citizenship Japan[2]
Alma mater

Tokyo Institute of Technology[1][3]

University of Tokyo[1][3]
Doctoral advisor Hisayoshi Yanai;[4] Takeshi Kamiya[4]
Other academic advisors Yasuharu Suematsu[4]
Doctoral students Isaac Chuang[5] (MIT); Charles Santori (Verily)
Other notable students Joseph Jacobson (MIT)
Known for Quantum-dot single-photon sources;[6] Differential phase-shift quantum key distribution; Quantum-dot spin qubits;[7] Exciton-polaritons.[8]
Notable awards

Medal of Honour with Purple Ribbon.[2]

Nishina Memorial Prize (1992)[9]

Yoshihisa Yamamoto (山本 喜久 Yamamoto Yoshihisa?) is a scientist and engineer and winner of the Medal of Honour with Purple Ribbon.[2][10]


Yamamoto was born in Tokyo on November 21, 1950.[1] In 1973 he got his B.S. degree from the Tokyo Institute of Technology.[1][3] He continued his studies at the University of Tokyo where he earned a M.S. in 1975 and a Ph.D. in 1978.[1][3] Since 1992 he is a professor of applied physics and electrical engineering at Stanford University in the United States. Since 2003 he also has professorships at the University of Tokyo and the National Institute of Informatics in Tokyo.


Yamamoto is primarily known for his work in the 1980s on optical fiber communications, semiconductor lasers, quantum non-demolition measurement and quantum optical effects. His most prominent work in the 1990s is in semiconductor quantum optics (especially involving microcavities and quantum wells) and quantum effects and noise in electronic devices [4].

During the 2000s, his most prominent work was on the development of optically-active quantum dots as a platform for quantum information processing (both as single-photon sources for quantum cryptography, and as hosts for spin qubits), and for his work on exciton-polaritons [5], [6]. Yamamoto was also active in the development of both theory and realization of quantum key distribution protocols. Landmark papers from this era include the demonstration of indistinguishable photons from a single quantum dot [7]; the proposal for biexciton cascade as a method for generating entangled photons (for QKD) from a single quantum dot [8] (this is the proposal underlying essentially all QD entangled-photon sources, such as those reviewed in [9]), and demonstration of control of a single spin qubit in a quantum dot using optical pulses [10].

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) of entanglement between a spin in a quantum dot and a photon emitted by it [11]. Work on exciton-polaritons continued, and since 2012, Yamamoto has pioneered the development of an optical computer [12], inspired by developments in quantum annealing and adiabatic quantum computing.


  1. ^ a b c d e f g Y. Yamamoto, et al., "Theory of a negative frequency feedback semiconductor laser," IEEE Journal of Quantum Electronics, vol.21, no.12, pp. 1919–1928, Dec 1985
  2. ^ a b c David Orenstein: Quantum research earns medal from Japanese emperor. Dated 2005-11-18. Original at stanford.edu, Archived March 9, 2012, at the Wayback Machine., Archived copy at WebCite
  3. ^ a b c d Yamamoto: Introduction of researcher. Dated 2004-09-10. Original at nii.ac.jp, Archived July 7, 2007, at the Wayback Machine.
  4. ^ a b c Yoshihisa Yamamoto (January 2005). "Curriculum Vitae" (PDF). Archived from the original (PDF) on July 18, 2010. Retrieved March 28, 2014. 
  5. ^ Yoshihisa Yamamoto: Group members. Retrieved on 2012-10-22. Original at stanford.edu, , Archived October 22, 2012, at the Wayback Machine.
  6. ^ [1]
  7. ^ Theory [2] and experiment [3].
  8. ^ Nature Physics review (2014)
  9. ^ Nishihna Memorial Foundation: Recipients of Nishina Memorial Prizes. Retrieved on 2012-11-15. Nishina Original at nishina-mf.or.jp. Archived November 15, 2012, at the Wayback Machine.
  10. ^ NII News: Professor Yoshihisa YAMAMOTO is awarded "Medal with Purple Ribbon". Dated 2005-11-02. Original at nii.ac.jp, , Archived September 29, 2006, at the Wayback Machine.