Alexei Yuryevich Kitayev

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Alexei Jurjewitsch Kitajew ( Russian Алексей Юрьевич Китаев , English transcription Alexei Yurevich Kitaev ; born August 26, 1963 ) is a Russian-American physicist. He introduced topological quantum computers in 1997.

Kitajew studied at the Moscow Institute for Physics and Technology (graduated in 1986) and received his doctorate in 1989 at the Landau Institute for Theoretical Physics . He then worked at the Landau Institute until 1998 and at Microsoft Research from 1999 to 2001. He is a professor at Caltech .

Kitajew initially dealt with solid-state physics, for example with quasicrystals and quantum chaos . Later he turned to quantum informatics and investigated complexity classes, topological quantum computers (for example with anyons to enable fault-tolerant computing ) and introduced his own phase estimation algorithm, which provided an alternative factorization algorithm to that of Peter Shor . He also worked with Michael Freedman . In 2006 he proposed an exactly solvable model for anyons for interacting spins on a honeycomb grid. In 2001 he investigated a toy model for Majorana fermions in a nanowire in the vicinity of a p-wave superconductor, which became current in 2012 through experimental evidence of Majorana fermions.

In 2008 he became a MacArthur Fellow . In 2012 he received the Fundamental Physics Prize and in 2015 the Dirac Medal of the ICTP. For 2017 he was awarded the Oliver E. Buckley Condensed Matter Prize .


  • with M. Vyalyi, Alexander Shen Classical and Quantum Computation . American Mathematical Society 2002
  • Fault-tolerant quantum computation by anyons . Preprint 1997 , Annals of Physics, Volume 303, 2003, pp. 2-30
  • Quantum computations: algorithms and error correction . Russian Mathematical Surveys, Volume 52, 1997, pp. 1191-1249
  • Unpaired Majorana fermions in quantum wires , Phys.-Usp., Volume 44 Supplement, 2001, pp. 131-136, Arxiv
  • Anyons in an exactly solved model and beyond , Ann. Phys., Vol. 321, 2006, pp. 2-111, Arxiv
  • with John Preskill : Topological Entanglement Entropy , Phys. Rev. Lett., Vol. 96, 2006, p. 110404, Arxiv
  • with M. Freedman, Michael J. Larsen, Zhenghan Wang: Topological Quantum Computation , Bulletin AMS, Volume 40, 2003, pp. 31-38, online

Web links

Individual evidence

  1. Phase Estimation Algorithm, lecture by Vazirani, pdf
  2. Freedman, Kitaev, Larsen, Wang Topological quantum computation , 2001