no code implementations • 7 Nov 2022 • Masahito Hayashi, Seunghoan Song
Oblivious transfer is considered as a cryptographic primitive task for quantum information processing over quantum network.
no code implementations • 29 May 2022 • Masahito Hayashi, Seunghoan Song
This paper unifiedly addresses two kinds of key quantum secure tasks, i. e., quantum versions of secret sharing (SS) and symmetric private information retrieval (SPIR) by using multi-target monotone span program (MMSP), which characterizes the classical linear protocols of SS and SPIR.
no code implementations • 28 Jun 2021 • Matteo Allaix, Seunghoan Song, Lukas Holzbaur, Tefjol Pllaha, Masahito Hayashi, Camilla Hollanti
A general statement on the converse bound for QPIR with coded and colluding servers is derived showing that the capacities of stabilizer QPIR and dimension-squared QPIR induced from any class of PIR are upper bounded by twice the classical capacity of the respective PIR class.
no code implementations • 14 Sep 2020 • Yuxiang Yang, Masahito Hayashi
Many quantum computational tasks have inherent symmetries, suggesting a path to enhancing their efficiency and performance.
Quantum Physics
no code implementations • 30 Dec 2010 • Toyohiro Tsurumaru, Masahito Hayashi
Then we show that this generalized (and thus broader) class of hash functions is in fact sufficient for the security of quantum cryptography.
Quantum Physics Information Theory Information Theory