DefenseTokyo wants domestic mass production of device as China enhances fleetChinese nuclear-powered submarines participate in a military display in the South China Sea. © ReutersRYOTA OGATASeptember 10, 2026 02:07 JSTTOKYO -- Japan plans to devise a cutting-edge sensor that employs quantum magnetic technology for aerial drones that can detect submarines, the Defense Ministry's fiscal 2027 budget request shows, as China increasingly operates in nearby waters.