Squeezed variance: (ΔX₁)²·(ΔX₂)² = 1/16 (minimum-uncertainty); Δφ = 1/(√N̄·e^r) sub-SQL

Squeezed-state variance product and phase-sensitivity gain. From framework F9, (ΔX₁)² = e^(−2r)/4 and (ΔX₂)² = e^(2r)/4. Product = 1/16 (preserving Heisenberg minimum uncertainty ΔX₁·ΔX₂ = 1/4). Sympy canonical pins: (ΔX₁)² =…