Quantum-Geometric Bound on Dynamical Instability in Bosonic Systems

Abstract

Quantum-geometric speed and dynamical instability are two natural rates for a driven quantum system, and their relation is unsettled even for exactly solvable dynamics. Here we show that for any multimode quadratic bosonic system referred to the bare-mode vacuum the Fubini-Study speed v_FS is the Frobenius norm of the symmetric, stretching part of the flow: the rate at which the vacuum becomes distinguishable from itself measures instantaneous symplectic stretching. That identity turns a classical stability estimate into a quantum-geometric bound, lambda_max<= sqrt(2) v_FS, sharp at every mode number and saturated by a resonant pure squeezer. The bound is not invertible: in a detuned parametric amplifier we hold either rate fixed while varying the other.