394 citations · 7.2k across the 232 of their papers we have counts for
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Fourier Analytic Approach to Phase Estimation
Hiroshi Imai, Masahito Hayashi
For a unified analysis on the phase estimation, we focus on the limiting distribution. It is shown that the limiting distribution can be given by the absolute square of the Fourier…
Discrete realization of group symmetric LOCC-detection of maximally entangled state
Masahito Hayashi
Group symmetric LOCC measurement for detecting maximally entangled state is considered. Usually, this type measurement has continuous-valued outcomes. However, any realizable measu…
Group theoretical study of LOCC-detection of maximally entangled state using hypothesis testing
Masahito Hayashi
In the asymptotic setting, the optimal test for hypotheses testing of the maximally entangled state is derived under several locality conditions for measurements. The optimal test…
Universal approximation of multi-copy states and universal quantum lossless data compression
Masahito Hayashi
We have proven that there exists a quantum state approximating any multi-copy state universally when we measure the error by means of the normalized relative entropy. While the qub…
Optimal ratio between phase basis and bit basis in QKD
Masahito Hayashi
In the original BB84 protocol, the bit basis and the phase basis are used with equal probability. Lo et al (J. of Cryptology, 18, 133-165 (2005)) proposed to modify the ratio betwe…
Universal coding for classical-quantum channel
Masahito Hayashi
We construct a universal code for stationary and memoryless classical-quantum channel as a quantum version of the universal coding by Csiszár and Körner. Our code is constructed by…
Discrimination of two channels by adaptive methods and its application to quantum system
Masahito Hayashi
The optimal exponential error rate for adaptive discrimination of two channels is discussed. In this problem, adaptive choice of input signal is allowed. This problem is discussed…
Quantum information with Gaussian states
X. -B. Wang, T. Hiroshima, A. Tomita +1
Quantum optical Gaussian states are a type of important robust quantum states which are manipulatable by the existing technologies. So far, most of the important quantum informatio…
Information Spectrum Approach to Second-Order Coding Rate in Channel Coding
Masahito Hayashi
Second-order coding rate of channel coding is discussed for general sequence of channels. The optimum second-order transmission rate with a constant error constraint is obtaine…