Yasunobu Nakamura

Yasunobu Nakamura
Yasunobu Nakamura
Born 1968
Osaka, Japan[1]
Known for

Work with "hybrid quantum information systems".[2][3]

First demonstration of coherent control of a Cooper pair box-based superconducting charge qubit.[4][5]
Scientific career
Fields Quantum information science, Superconducting quantum computing

Yasunobu Nakamura (中村 泰信 Nakamura Yasunobu) is a Japanese physicist. He is a professor at the University of Tokyo's Research Center for Advanced Science and Technology (RCAST)[6] and the Principal Investigator of the Superconducting Quantum Electronics Research Team at the Center for Emergent Matter Science (CEMS) within RIKEN.[7] He has contributed primarily to the area of quantum information science,[8] particularly in superconducting quantum computing and hybrid quantum systems.[9][10][11]

Education and early work

Yasunobu Nakamura obtained his Bachelor of Science (1990), Master of Science (1992), and Ph.D. (2011) degrees at the University of Tokyo. In 1999, as a researcher at NEC, Nakamura and collaborators Yuri Pashkin and Jaw-Shen Tsai demonstrated "electrical coherent control of a qubit in a solid-state electronic device"[4] and in 2001 "realized the first measurement of the Rabi oscillations associated with the transition between two Josephson levels in the Cooper pair box"[12][13] in a configuration developed by Michel Devoret and colleagues in 1998.[12][14]

In 2000, Nakamura was featured as a "Younger Scientist" by the Japan Society of Applied Physics for his work at NEC in "quantum-state control of nanoscale superconducting devices."[15] From 2001-2002, he visited the group of Hans Mooij at TU Delft on a sabbatical from NEC, where he worked with Irinel Chiorescu, Kees Harmans, and Mooij to create the first flux qubit.[16][17][18] In 2003, he was named one of MIT Technology Review's top innovators under 35 years old, in which editors noted that "Nakamura and a collaborator got two qubits to interact in a manner that had been predicted but never demonstrated" at the time.[19]

Current work

As of 3 October 2016, the Japan Science and Technology Agency (科学技術振興機構) announced funding for Nakamura's work through their Exploratory Research for Advanced Technology (ERATO) program.[20] The project, entitled Macroscopic Quantum Machines,[21] seeks to dramatically improve quantum state control technology to further the field of quantum computing. Of principal focus is the development of a highly scalable platform for implementing quantum information processing techniques, as well as the creation of a hybrid quantum system that interfaces with microwave quantum optics.

A flux qubit and superconducting microwave cavity form a coupled system that connects to a parametric phase-locked oscillator. In the paper "Single microwave-photon detector using an artificial Λ-type three-level system" published in Nature Communications in 2016, Nakamura and collaborators manipulated this three-level system in such a way that single photons were detected with an "efficiency of 0.66±0.06 with a low dark-count probability of 0.014±0.001 and a reset time of ∼400 ns."[22]

In recent years, Nakamura and collaborators have published their findings on the efficient detection of single microwave frequency photons,[22] the suppression of quasiparticles in superconducting quantum computing environments for the improvement of qubit coherence times,[23] the development of "a deterministic scheme to generate maximal entanglement between remote superconducting atoms, using a propagating microwave photon as a flying qubit",[24] and the realization of a hybrid quantum system by the strong, coherent coupling between a collective magnetic mode of a ferromagnetic sphere and a superconducting qubit.[2]

Nakamura has spoken several times at quantum information science conferences, including at the University of Vienna in 2014,[25] the Institute for Theoretical Atomic Molecular and Optical Physics at Harvard University[26][27] and the National Center of Competence in Research's Quantum Science and Technology Monte Verità conference in 2015,[28] and at the Institute for Quantum Computing at the University of Waterloo in 2016.[29]

Honors and awards

References

  1. ↑ "RIKEN Tuning Into Quantum Computers". 2007-08-17. Retrieved 2017-06-19.
  2. 1 2 Y. Tabuchi, S. Ishino, A. Noguchi, T. Ishikawa, R. Yamazaki, K. Usami, and Y. Nakamura, "Coherent coupling between a ferromagnetic magnon and a superconducting qubit", Science 349, 405-408 (2015), doi:10.1126/science.aaa3693
  3. ↑ Y. Tabuchi, S. Ishino, T. Ishikawa, R. Yamazaki, K. Usami, and Y. Nakamura, "Hybridizing Ferromagnetic Magnons and Microwave Photons in the Quantum Limit", Physical Review Letters 113, 083603 (2014), doi:10.1103/PhysRevLett.113.083603, arxiv:1405.1913
  4. 1 2 Y. Nakamura, Yu. A. Pashkin and J.- S. Tsai, "Coherent control of macroscopic quantum states in a single-Cooper-pair box", Nature 398, 786-788 (1999), doi:10.1038/19718, arXiv:9904003
  5. ↑ T. Yamamoto, Yu. A. Pashkin, O. Astafiev, Y. Nakamura, and J.- S. Tsai, "Demonstration of conditional gate operation using superconducting charge qubits", Nature 425, 941-944 (2003), doi:10.1038/nature02015, arxiv:0311067
  6. ↑ "Research Groups". Retrieved 2016-12-21.
  7. ↑ "Superconducting Quantum Electronics Research Team". Retrieved 2016-12-21.
  8. ↑ T. D. Ladd, F. Jelezko, R. Laflamme, Y. Nakamura, C. Monroe, and J.L. O'Brien, "Quantum computers", Nature 464, 45-53 (2010), doi:10.1038/nature08812, arxiv:1009:2267
  9. ↑ "マイナビニュース". 2015-07-10. Retrieved 2016-12-22.
  10. ↑ "ようこそ量子 Interview". 2016-11-15. Retrieved 2016-12-22.
  11. ↑ "Science Daily 2015". 2015-08-03. Retrieved 2016-12-22.
  12. 1 2 "Bell Prize 2013". Retrieved 2016-12-21.
  13. ↑ Y. Nakamura, Y.A. Pashkin, and J.S. Tsai, "Rabi Oscillations in a Josephson-Junction Charge Two-Level System", Physical Review Letters 87, 246601 (2001), doi:10.1103/PhysRevLett.87.246601
  14. ↑ V. Bouchiat, D. Vion, P. Joyez, D. Esteve and M. H. Devoret, "Quantum coherence with a single Cooper pair", Physica Scripta T76, 165-170 (1998), doi:10.1238/Physica.Topical.076a00165
  15. ↑ "JSAP Younger Scientists" (PDF). Retrieved 2016-12-21.
  16. ↑ I. Chiorescu, Y. Nakamura, C. J. P. M. Harmans, and J. E. Mooij, "Coherent Quantum Dynamics of a Superconducting Flux Qubit", Science 299, 5614, 1869-1871, (2003), doi:10.1126/science.1081045, arxiv:0305461
  17. ↑ J. Clarke, "Flux Qubit Completes the Hat Trick", Science 299, 5614, 1850-1851, (2003), doi:10.1126/science.1083001
  18. ↑ "The first Delft qubit". 2017-11-04. Retrieved 2017-11-04.
  19. 1 2 "Innovators Under 35". Retrieved 2016-12-21.
  20. ↑ "戦略的創造研究推進事業における". Retrieved 2016-12-21.
  21. ↑ "研究総括および研究領域". Retrieved 2016-12-21.
  22. 1 2 K. Inomata, Z. Lin, K. Koshino, W. D. Oliver, J.- S. Tsai, T. Yamamoto, and Y. Nakamura, "Single microwave-photon detector using an artificial Λ-type three-level system", Nature Communications 7, 12303 (2016), doi:10.1038/ncomms12303
  23. ↑ S. Gustavsson, F. Yan, G. Catelani, J. Bylander, A. Kamal, J. Birenbaum, D. Hover, D. Rosenberg, G. Samach, A. P. Sears, S. J. Weber, J. L. Yoder, J. Clarke, A. J. Kerman, F. Yoshihara, Y. Nakamura, T. P. Orlando, and W. D. Oliver, "Suppressing relaxation in superconducting qubits by quasiparticle pumping", Science 354, 6319, 1573-1577 (2016), doi:10.1126/science.aah5844
  24. ↑ K. Koshino, K. Inomata, Z. R. Lin, Y. Tokunaga, T. Yamamoto, and Y. Nakamura, "Theory of Deterministic Entanglement Generation between Remote Superconducting Atoms", Physical Review Applied 7, 064006 (2017), doi:10.1103/PhysRevApplied.7.064006
  25. ↑ "University of Vienna 2014". Retrieved 2016-12-21.
  26. ↑ "ITAMP". Retrieved 2016-12-21.
  27. ↑ "ITAMP Video". 2015-07-15. Retrieved 2016-12-22.
  28. ↑ "NCCR QSIT". Retrieved 2016-12-21.
  29. ↑ "IQC 2016". Retrieved 2016-12-21.
  30. ↑ "JSAP Younger Scientists" (PDF). Retrieved 2017-01-24.
  31. ↑ "2016 Sir Martin Wood Prize for Japan". Oxford Instruments. Retrieved 2017-01-24.
  32. ↑ "NEC Awards FY1999". Retrieved 2017-01-24.
  33. ↑ "Agilent Technologies Prize". 2004-06-17. Retrieved 2016-12-21.
  34. ↑ "Simon Memorial Prize: Past Winners". Retrieved 2017-06-13.
  35. ↑ "RCAST News". 2014. Retrieved 2017-01-24.
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