5 citations · 5 across the 2 of their papers we have counts for
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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…
Quantum Measurement and Fluctuations in Nanostructures
Akira Shimizu
Measurement and fluctuations are closely related to each other in quantum mechanics. This fact is explicitly demonstrated in the case of a quantum non-demolition photodetector whic…
First-kind measurements, non-demolition measurements, and conservation laws
Akira Shimizu, Kazuko Fujita
A general discussion is given for first-kind (FK) and quantum non-demolition (QND) measurements. The general conditions for these measurements are derived, including the most gener…