End‑use industry segmentation translates the technical capabilities of quantum sensors into commercial outcomes across distinct sectors. The defense & aerospace industry leads adoption, integrating navigation, gravimetry, and magnetic sensing into missile guidance, satellite attitude control, and battlefield surveillance, thereby representing the highest revenue contribution. Healthcare leverages SQUID‑based magnetoencephalography and NV‑diamond magnetometers for neural imaging and point‑of‑care diagnostics, forming a rapidly expanding niche. Semiconductor manufacturing employs quantum sensors for process monitoring, particularly in lithography alignment and wafer‑scale stress mapping, contributing a steady growth stream. The automotive sector incorporates atomic interferometers for autonomous vehicle navigation and advanced driver‑assistance systems, marking an emerging revenue pillar. Finally, research & development laboratories act as early adopters, purchasing a diverse mix of sensor types to explore quantum phenomena, which sustains a baseline demand across the market. This industry‑level taxonomy clarifies how each vertical underpins the overall market size and informs strategic investment decisions.