3 papers
quant-ph2026
Asymptotically tight security analysis of quantum key distribution based on universal source compression
Takaya Matsuura, Shinichiro Yamano, Yui Kuramochi +2
Practical quantum key distribution (QKD) protocols require a finite-size security proof. The phase error correction (PEC) approach is one of the general strategies for security ana…
quant-ph2025
Trade-off between Gradient Measurement Efficiency and Expressivity in Deep Quantum Neural Networks
Koki Chinzei, Shinichiro Yamano, Quoc Hoan Tran +2
Quantum neural networks (QNNs) require an efficient training algorithm to achieve practical quantum advantages. A promising approach is gradient-based optimization, where gradients…
quant-ph2024
Tight concentration inequalities for quantum adversarial setups exploiting permutation symmetry
Takaya Matsuura, Shinichiro Yamano, Yui Kuramochi +2
We developed new concentration inequalities for a quantum state on an -qudit system or measurement outcomes on it that apply to an adversarial setup, where an adversary prepares…