1.2k citations · 1.7k across the 24 of their papers we have counts for
24 papers
Estimating the spectral radius of Bell-type operator via finite dimensional approximation of orthogonal projections
Yuki Fujii, Toyohiro Tsurumaru
We establish a new decomposition formula for two orthogonal projections P and Q on a separable Hilbert space V. This formula yields an orthogonal direct sum decomposition of V into…
Security loophole in error verification in quantum key distribution
Toyohiro Tsurumaru, Akihiro Mizutani, Toshihiko Sasaki
The security of quantum key distribution (QKD) is evaluated based on the secrecy of Alice's key and the correctness of the keys held by Alice and Bob. A practical method for ensuri…
Tight scaling of key rate for differential-phase-shift quantum key distribution
Akihiro Mizutani, Toyohiro Tsurumaru
The performance of quantum key distribution (QKD) protocols is evaluated based on the ease of implementation and key generation rate. Among major protocols, the differential-phase-…
Indistinguishability between quantum randomness and pseudo-randomness under efficiently calculable randomness measures
Toyohiro Tsurumaru, Tsubasa Ichikawa, Yosuke Takubo +3
We present a no-go theorem for the distinguishability between quantum random numbers (i.e., random numbers generated quantum mechanically) and pseudo-random numbers (i.e., random n…
Information-theoretically secure equality-testing protocol with dispute resolution
Go Kato, Mikio Fujiwara, Toyohiro Tsurumaru
There are often situations where two remote users each have data, and wish to (i) verify the equality of their data, and (ii) whenever a discrepancy is found afterwards, determine…
Long-term secure distributed storage using quantum key distribution network with third-party verification
Mikio Fujiwara, Ryo Nojima, Toyohiro Tsurumaru +3
The quantum key distribution network with Vernam's One Time Pad encryption and secret sharing are powerful security tools to realize an information theoretically secure distributed…