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33 papers · 2 filters
A note on quantum entropy inequalities and channel capacities
Heng Fan
Quantum entropy inequalities are studied. Some quantum entropy inequalities are obtained by several methods. For entanglement breaking channel, we show that the entanglement-assist…
Violation of local uncertainty relations as a signature of entanglement
Holger F. Hofmann, Shigeki Takeuchi
Entangled states represent correlations between two separate systems that are too precise to be represented by products of local quantum states. We show that this limit of precisio…
Practical scheme for the optimal measuremnet in quantum interferometric devices
Masahiro Takeoka, Masashi Ban, Masahide Sasaki
We apply a Kennedy-type detection scheme, which was originally proposed for a binary communications system, to interferometric sensing devices. We show that the minimum detectable…
Experimental investigation of pulsed entangled photons and photonic quantum channels
Yoshihiro Nambu, Koji. Usami, Akihisa Tomita +5
The development of key devices and systems in quantum information technology, such as entangled particle sources, quantum gates and quantum cryptographic systems, requires a reliab…
A New Strategy of Quantum-State Estimation for Achieving the Cramer-Rao Bound
Koji Usami, Yoshihiro Nambu, Yoshiyuki Tsuda +2
We experimentally analyzed the statistical errors in quantum-state estimation and examined whether their lower bound, which is derived from the Cramer-Rao inequality, can be truly…
Generation of pulsed polarization entangled photon pair via a space cascaded two-crystal geometry
Bao-Sen Shi, Akihisa Tomita
The generation of pulsed polarization entangled photon pair has been realized using type-I phase matching in the spontaneous parametirc downconversion process in a space cascaded t…