A recent study published in Physical Review Letters by Assistant Professor Haocun Yu and her colleagues presents a groundbreaking tabletop experiment that reconciles two fundamental theories in physics: quantum mechanics and general relativity. While general relativity describes gravity on a large scale, quantum mechanics governs the subatomic world. The challenge has been that gravity is extraordinarily weak at the quantum scale, making it difficult to measure. To address this, the research team constructed a highly stable 50-kilometer optical interferometer, which can fit on a tabletop, to detect gravitational effects in quantum systems. This innovative setup successfully measured a gravitationally induced phase signal, demonstrating the potential for laboratory-scale measurements of gravitational redshift, a prediction of general relativity. Yu, a Ph.D. graduate from the Massachusetts Institute of Technology, is now building a research program at the University of Tennessee, Knoxville, focusing on quantum optics and sensing, with the goal of advancing quantum science and exploring practical applications of quantum phenomena.