World's Best Scientists 2026 revealed!
Masato Koashi

Masato Koashi

D-Index & Metrics

Engineering and Technology

D-Index
47
Citations
10291
World Ranking
4783
National Ranking
76

Overview

Masato Koashi is affiliated with the University of Tokyo in Japan and has a research focus primarily in Computer Science and Physics and Astronomy. Their work spans both theoretical and applied aspects, with significant contributions to quantum information science and related areas.

The scientist's main fields of study include:

  • Computer Science
  • Physics and Astronomy

The subfields in which they have published notably are:

  • Artificial Intelligence
  • Atomic and Molecular Physics, and Optics
  • Computational Theory and Mathematics
  • Electrical and Electronic Engineering
  • Instrumentation

Masato Koashi's primary research topics cover several specialized areas within quantum science and technology, including:

  • Quantum Information and Cryptography
  • Quantum Computing Algorithms and Architecture
  • Quantum Mechanics and Applications
  • Quantum-Dot Cellular Automata
  • Quantum and electron transport phenomena
  • Orbital Angular Momentum in Optics
  • Advanced Optical Sensing Technologies

The scientist's publication record includes papers in a range of scientific venues, with a strong presence in both open-access archives and peer-reviewed journals. Frequent publication venues include:

  • arXiv (Cornell University)
  • Physical review. A/Physical review, A
  • Physical Review Research
  • Nature Physics
  • Quantum

Some recent and notable papers authored or coauthored by Masato Koashi are:

  • "Time-Efficient Constant-Space-Overhead Fault-Tolerant Quantum Computation", 2024, Nature Physics
  • "Deterministic preparation of W states via spin-photon interactions", 2021, Physical review. A/Physical review, A
  • "General framework for constructing fast and near-optimal machine-learning-based decoder of the topological stabilizer codes", 2020, Physical Review Research
  • "Black holes as clouded mirrors: the Hayden-Preskill protocol with symmetry", 2023, Quantum
  • "Polylog-overhead highly fault-tolerant measurement-based quantum computation: all-Gaussian implementation with Gottesman-Kitaev-Preskill code", 2020, arXiv (Cornell University)

Masato Koashi collaborates frequently with several coauthors in the field, with some of the most frequent collaborators being:

  • Takaya Matsuura
  • Toshihiko Sasaki
  • Hayata Yamasaki
  • Shinichiro Yamano
  • Yui Kuramochi

Best Publications

  • Quantum entanglement for secret sharing and secret splitting

    Anders Karlsson;Masato Koashi;Nobuyuki Imoto

  • Monogamy of quantum entanglement and other correlations

    Masato Koashi;Masato Koashi;Andreas Winter

  • Practical quantum key distribution protocol without monitoring signal disturbance

    Toshihiko Sasaki;Yoshihisa Yamamoto;Masato Koashi

  • Simple security proof of quantum key distribution based on complementarity

    M Koashi

  • Exact Eigenstates and Magnetic Response of Spin-1 and Spin-2 Bose-Einstein Condensates

    Masato Koashi;Masahito Ueda

  • Concentration and purification scheme for two partially entangled photon pairs

    Takashi Yamamoto;Masato Koashi;Nobuyuki Imoto

  • Direct observation of Hardy's paradox by joint weak measurement with an entangled photon pair

    Kazuhiro Yokota;Takashi Yamamoto;Masato Koashi;Nobuyuki Imoto

  • Experimental extraction of an entangled photon pair from two identically decohered pairs

    Takashi Yamamoto;Masato Koashi;Şahin Kaya Özdemir;Nobuyuki Imoto;Nobuyuki Imoto

  • Wide-band quantum interface for visible-to-telecommunication wavelength conversion.

    Rikizo Ikuta;Yoshiaki Kusaka;Tsuyoshi Kitano;Hiroshi Kato

  • Unconditionally secure key distribution based on two nonorthogonal states.

    Kiyoshi Tamaki;Masato Koashi;Nobuyuki Imoto

  • Simple and Efficient Quantum Key Distribution with Parametric Down-Conversion

    Yoritoshi Adachi;Takashi Yamamoto;Masato Koashi;Nobuyuki Imoto

  • Quantum Cryptography Based on Split Transmission of One-Bit Information in Two Steps

    Masato Koashi;Nobuyuki Imoto

  • Secure Quantum Key Distribution with an Uncharacterized Source

    Masato Koashi;John Preskill

  • Frequency-domain Hong–Ou–Mandel interference

    Toshiki Kobayashi;Rikizo Ikuta;Shuto Yasui;Shigehito Miki

  • Unconditional security of coherent-state quantum key distribution with a strong phase-reference pulse.

    Masato Koashi

  • Entangled webs: Tight bound for symmetric sharing of entanglement

    Masato Koashi;Vladimír Bužek;Vladimír Bužek;Nobuyuki Imoto

  • Quantum key distribution with an efficient countermeasure against correlated intensity fluctuations in optical pulses

    Ken Ichiro Yoshino;Mikio Fujiwara;Kensuke Nakata;Tatsuya Sumiya

  • Theory of spin-2 Bose-Einstein condensates: Spin correlations, magnetic response, and excitation spectra

    Masahito Ueda;Masato Koashi

  • Reversing Measurement and Probabilistic Quantum Error Correction

    Masato Koashi;Masahito Ueda

  • Generation of high-fidelity four-photon cluster state and quantum-domain demonstration of one-way quantum computing.

    Yuuki Tokunaga;Yuuki Tokunaga;Shin Kuwashiro;Takashi Yamamoto;Masato Koashi

  • Probabilistic manipulation of entangled photons

    Masato Koashi;Takashi Yamamoto;Nobuyuki Imoto

Frequent Co-Authors

Nobuyuki Imoto
Nobuyuki Imoto Osaka University
Taro Yamashita
Taro Yamashita Tohoku University
Shigehito Miki
Shigehito Miki National Institute of Information and Communications Technology
Mikio Fujiwara
Mikio Fujiwara National Institute of Information and Communications Technology
Yu-xi Liu
Yu-xi Liu Tsinghua University
Masahide Sasaki
Masahide Sasaki National Institute of Information and Communications Technology
Andreas Winter
Andreas Winter University of Cologne
Masahito Ueda
Masahito Ueda University of Tokyo
Sandu Popescu
Sandu Popescu University of Bristol
Franco Nori
Franco Nori University of Michigan–Ann Arbor

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