In a main-stage Defcon talk on Saturday, the pair will present an open source and affordable quantum sensor that can serve a variety of uses, from medical technologies to GPS alternatives. Quantum sensors detect extremely slight variations in magnetic and electrical fields, enabling ultra-precise measurements. Atomic clocks that keep nearly perfect time, for example, are quantum sensors that have been in use for decades. So the Quantum Village's relatively affordable, open source “Uncut Gem” project creates a real opportunity for more people to build their own quantum sensors and explore the technology. In addition to potential medical applications, quantum sensors can be used in alternative navigation technologies that track electromagnetic wave interference.