https://physicsoverflow.org/729/stability-of-the-vacuum-state-of-interacting-quantum-fields?show=2889
Stability of the vacuum state of interacting quantum fields | PhysicsOverflow
"Stability" is generally taken to be the justification for requiring that the spectrum of the Hamiltonian ... post has been migrated from (A51.SE)
of thevacuum statequantum fieldsstabilityinteracting
https://cpb.iphy.ac.cn/en/article/doi/10.1088/1674-1056/20/2/024203?viewType=HTML
Decoherence of photon-subtracted squeezed vacuum state in dissipative channel
This paper investigates the decoherence of photo-subtracted squeezed vacuum state (PSSVS) in dissipative channel by describing its statistical properties with...
squeezed vacuumdecoherencephotonsubtractedstate