Quantum Communication Market Size, Share & Industry Analysis, By Architecture (Space-to-Ground QKD, Inter-Satellite QKD/Entanglement, Airborne Relay QKD, Fiber Metro/Long-Haul QKD, Maritime Free-Space QKD), By Product (Terminals (Space/Air/Sea/Ground), Photonic Components, PAT & Control, Security Stack, Test & Assurance), By Service (Secure Link-as-a-Service, Sovereign Ground/Key Services, Integration & MRO, Validation & Accreditation, Training & Ops Support), By End User (Defense Ministries & Armed Forces, Space Agencies & Sat Operators, & Others) and Regional Forecast, 2026-2034