2 papers
quant-ph2026
Hamiltonian Thresholds for Objective Records
Jie Gu
Classical objectivity requires an environment to witness a pointer value, not merely to decohere it. We derive microscopic Hamiltonian laws for this distinction. Exact QND product…
quant-ph2026
Finite-frequency fluctuation-response bounds for open quantum systems
Jie Gu, Kangqiao Liu
We derive a finite-frequency fluctuation-response inequality for Markovian open quantum systems in an input-output setting. For any downstream measurement of the emitted field, the…