3 papers
quant-ph2020
A Formalism Useful to Study Beyond Squeezing in Non-linear Quantum Optics
Noriaki Aibara, Naoaki Fujimoto, So Katagiri +3
A general formalism is given in quantum optics within a ring cavity, in which a non-linear material is stored. The method is Feynman graphical one, expressing the transition amplit…
quant-ph2019
Measurement theory in classical mechanics
So Katagiri
Measurement theory in classical mechanics is investigated in the formulation of classical mechanics by Koopman and von Neumann (KvN), using Hilbert space. It is shown that the clas…
hep-th2019
Beyond Squeezing à la Virasoro Algebra
So Katagiri, Akio Sugamoto, Koichiro Yamaguchi +1
The generalization of squeezing is realized in terms of the Virasoro algebra. The higher-order squeezing can be introduced through the higher-order time-dependent potential, in whi…