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9 papers · 2 filters
Quantum Zeno and anti-Zeno effects by indirect measurement with finite errors
Kazuki Koshino, Akira Shimizu
We study the quantum Zeno effect and the anti-Zeno effect in the case of `indirect' measurements, where a measuring apparatus does not act directly on an unstable system, for a rea…
Optimal sequence of quantum measurements in the sense of Stein's lemma in quantum hypothesis testing
Masahito Hayashi
We derive a necessary and sufficient condition for a sequence of quantum measurements to achieve the optimal performance in quantum hypothesis testing. Using an information-spectru…
General formulas for fixed-length quantum entanglement concentration
Masahito Hayashi
General formulas of entanglement concentration are derived by using an information-spectrum approach for the i.i.d. sequences and the general sequences of partially entangled pure…
General formulas for capacity of classical-quantum channels
Masahito Hayashi, Hiroshi Nagaoka
The capacity of a classical-quantum channel (or in other words the classical capacity of a quantum channel) is considered in the most general setting, where no structural assumptio…
An Information-Spectrum Approach to Classical and Quantum Hypothesis Testing for Simple Hypotheses
Hiroshi Nagaoka, Masahito Hayashi
The information-spectrum analysis made by Han for classical hypothesis testing for simple hypotheses is extended to a unifying framework including both classical and quantum hypoth…
Error exponents for entanglement concentration
Masahito Hayashi, Masato Koashi, Keiji Matsumoto +2
Consider entanglement concentration schemes that convert n identical copies of a pure state into a maximally entangled state of a desired size with success probability being close…