2 papers
quant-ph2026
Operator-frame geometry of non-compact quantum systems with frame-vacuum phase transitions
Satoshi Tanaka, Gonzalo Ordonez, Masatoshi Kubota +2
We formulate the geometric structure of non-compact bosonic quantum systems in regimes where vacuum instability renders the relevant quantum states non-normalizable, causing conven…
quant-ph2025
Theory of Stationary Photon Emission from a Steadily Driven Parametric Oscillator Based on the Complex Spectral Analysis of the Heisenberg Equation
Kazuki Kanki, Satoshi Tanaka
We show how the properties of photon emission to a continuous field from a parametric oscillator relate to the behavior of the complex eigenfrequencies of the oscillator. The param…