Explore the low-energy interface of quantum mechanics and gravity in this 53-minute conference talk by Igor Pikovski, presented at the Kavli Institute for Theoretical Physics. Delve into novel experiments for fundamental physics, focusing on the intersection of quantum mechanics and gravity at low energies. Examine topics including phase shifts, time dilation, atomic clocks, strain sensitivity, and clock spectroscopy. Investigate the quantum mechanical aspects of time dilation, the quantum twin paradox, and Hamiltonian formulation. Learn about gravitational redshift, edge coherence, Gaussian decay, and initial entanglement. Gain insights into current experiments and their implications for our understanding of fundamental physics. Conclude with a comprehensive prediction of the field's future developments.