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math-ph2008★ 4 cited
Geometry of Quasi-Free States of CCR Algebras
Shigeru Yamagami
Geometric positions of square roots of quasi-free states of CCR algebras are investigated together with an explicit formula for transition amplitudes among them.
math-ph2008★ 12 cited
Geometric Mean of States and Transition Amplitudes
Shigeru Yamagami
The transition amplitude between square roots of states, which is an analogue of Hellinger integral in classical measure theory, is investigated in connection with operator-algebra…