5 papers
Recovery of the second law in fully quantum thermodynamics
Naoto Shiraishi, Ryuji Takagi
Quantum thermodynamics investigates how robust the second law of thermodynamics serves as the unique fundamental law in the small quantum world. To tackle this problem, the quantum…
Quantum algorithms for Uhlmann transformation
Takeru Utsumi, Yoshifumi Nakata, Qisheng Wang +1
Uhlmann's theorem is a central result in quantum information theory, which associates the closeness of two quantum states with that of their purifications. The theorem also well ch…
Measuring non-Gaussianity with Correlation
Oliver Hahn, Ryuji Takagi
Quantum non-Gaussianity is a key resource for quantum advantage in continuous-variable systems. We introduce a general framework to quantify non-Gaussianity based on correlation ge…
Universal tradeoff relations between resource cost and irreversibility of channels: General-resource Wigner-Araki-Yanase theorems and beyond
Hiroyasu Tajima, Koji Yamaguchi, Ryuji Takagi +1
Quantum technologies offer exceptional -- sometimes almost magical -- speed and performance, yet every quantum process costs physical resources. Designing next-generation quantum d…
Symmetric channel verification for purifying noisy quantum channels
Kento Tsubouchi, Yosuke Mitsuhashi, Ryuji Takagi +1
Symmetry inherent in quantum states has been widely used to reduce the effect of noise in quantum error correction and a quantum error mitigation technique known as symmetry verifi…