5 citations · 5 across the 2 of their papers we have counts for
9 papers
Macroscopic entanglement in Quantum Computation
Akihisa Ukena, Akira Shimizu
We investigate macroscopic entanglement of quantum states in quantum computers, where we say a quantum state is entangled macroscopically if the state has superposition of macrosco…
Anomalous quantum states in finite macroscopic systems
Akira Shimizu, Takayuki Miyadera, Akihisa Ukena
We consider finite macroscopic systems, i.e., systems of large but finite degrees of freedom, which we believe are poorly understood as compared with small systems and infinite sys…
Fragility of Thermodynamically-Abnormal Ground States of Finite Systems
Takayuki Miyadera, Akira Shimizu
We study a general macroscopic quantum system of a finite size, which will exhibit a symmetry breaking if the system size goes to infinity, when the system interacts with an enviro…
Charge superselection rule does not rule out pure states of subsystems to be coherent superpositions of states with different charges
Akira Shimizu, Takayuki Miyadera
We consider a huge quantum system that is subject to the charge superselection rule, which requires that any pure state must be an eigenstate of the total charge. We regard some pa…
Dicke-superradiance in electronic systems coupled to reservoirs
T. Brandes, J. Inoue, A. Shimizu
We present theoretical results for superradiance, i.e. the collective coherent decay of a radiating system, in semiconductor structures. An optically active region can become super…
Statistical Theory of Energy Transfer to Small and Chaotic Quantum Systems Induced by a Slowly-Varying External Field
Yasuhiro Higashiyama, Akira Shimizu
We study nonequilibrium properties of small and chaotic quantum systems, i.e., non-integrable systems whose size is small in the sense that the separations of energy levels are non…