Reporting to the Director of R&D, Quantum RF, this physicist will independently own defined experiments and testbeds under senior technical direction, translate atomic, optical, and RF behavior into measurable sensor improvements, and carry validated improvements into integrated QRF systems. Analyze experimental data with appropriate uncertainty, noise, and repeatability treatment; use atomic, optical, or electromagnetic models to guide experiments, interpret results, and investigate discrepancies among predicted, benchtop, subsystem, and integrated-system performance.