Mixed State Entanglement Measures for Intermediate Separability (2009)
Ichikawa, Tsubasa, Huber, Marcus, Krammer, Philipp, Hiesmayr, Beatrix C.
To determine whether a given multipartite quantum state is separable with respect to some partition we construct a family of entanglement measures R_m. This is done utilizing generalized concurrences...
Separability of N-particle Fermionic States for Arbitrary Partitions (2009)
Ichikawa, Tsubasa, Sasaki, Toshihiko, Tsutsui, Izumi
We present a criterion of separability for arbitrary s partitions of N-particle fermionic pure states. We show that, despite the superficial non-factorizability due to the antisymmetry required by...
Entanglement Measures for Intermediate Separability of Quantum States (2008)
Ichikawa, Tsubasa, Sasaki, Toshihiko, Tsutsui, Izumi
We present a family of entanglement measures R_m which act as indicators for separability of n-qubit quantum states into m subsystems for arbitrary 2 \leq m \leq n. The measure R_m vanishes if the...
Exchange Symmetry and Multipartite Entanglement (2008)
Ichikawa, Tsubasa, Sasaki, Toshihiko, Tsutsui, Izumi, Yonezawa, Nobuhiro
Entanglement of multipartite systems is studied based on exchange symmetry under the permutation group S_N. With the observation that symmetric property under the exchange of two constituent states...
Testing the EPR Locality using B-Mesons (2008)
Ichikawa, Tsubasa, Tamura, Satoshi, Tsutsui, Izumi
We study the possibility of testing local realistic theory (LRT), envisioned implicitly by Einstein, Podolsky and Rosen in 1935, based on the Bell inequality for the correlations in the decay modes...
Tsubasa Ichikawa, Izumi Tsutsui, Taksu Cheon
We present a novel formulation of quantum game theory based on the Schmidt decomposition, which has the merit that the entanglement of quantum strategies is manifestly quantified. We apply this...
Quantum Game Theory Based on the Schmidt Decomposition: Can Entanglement Resolve Dilemmas? (2007)
Ichikawa, Tsubasa, Tsutsui, Izumi, Cheon, Taksu
We present a novel formulation of quantum game theory based on the Schmidt decomposition, which has the merit that the entanglement of quantum strategies is manifestly quantified. We apply this...
Duality, Phase Structures and Dilemmas in Symmetric Quantum Games (2006)
Ichikawa, Tsubasa, Tsutsui, Izumi
Symmetric quantum games for 2-player, 2-qubit strategies are analyzed in detail by using a scheme in which all pure states in the 2-qubit Hilbert space are utilized for strategies. We consider two...