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10 papers · 2 filters
Quantum-state estimation problem via optimal design of experiments
Jun Suzuki
In this paper, we study the quantum-state estimation problem in the framework of optimal design of experiments. We first find the optimal designs about arbitrary qubit models for p…
One-shot quantum error correction of classical and quantum information
Yoshifumi Nakata, Eyuri Wakakuwa, Hayata Yamasaki
Quantum error correction (QEC) is one of the central concepts in quantum information science and also has wide applications in fundamental physics. The capacity theorems provide so…
Efficient computation of the Nagaoka--Hayashi bound for multi-parameter estimation with separable measurements
Lorcán Conlon, Jun Suzuki, Ping Koy Lam +1
Finding the optimal attainable precisions in quantum multiparameter metrology is a non trivial problem. One approach to tackling this problem involves the computation of bounds whi…
Black holes as clouded mirrors: the Hayden-Preskill protocol with symmetry
Yoshifumi Nakata, Eyuri Wakakuwa, Masato Koashi
The Hayden-Preskill protocol is a qubit-toy model of the black hole information paradox. Based on the assumption of scrambling, it was revealed that quantum information is instantl…
One-Shot Hybrid State Redistribution
Eyuri Wakakuwa, Yoshifumi Nakata, Min-Hsiu Hsieh
We consider state redistribution of a "hybrid" information source that has both classical and quantum components. The sender transmits classical and quantum information at the same…
Superconducting-like heat current: Effective cancellation of current-dissipation trade off by quantum coherence
Hiroyasu Tajima, Ken Funo
Producing a large current typically requires large dissipation, as is the case in electric conduction, where Joule heating is proportional to the square of the current. Stochastic…