Good vibrations for quantum communications: Engineers couple single phonon to single atomic spin

Harvard engineers achieved a first by coupling a single phonon—a quantum of vibrational energy—to a single atomic spin, enabling sound-based quantum information transfer. The breakthrough, published in Nature, replaces light or electricity with phonons as quantum carriers, potentially revolutionizing quantum communication and computing architectures. This phonon-spin interaction was demonstrated at the Harvard John A. Paulson School of Engineering and Applied Sciences, marking a milestone in quantum acoustics. The advancement could lead to more efficient, scalable quantum networks by leveraging mechanical vibrations, which are less prone to interference than photons. This work paves the way for hybrid quantum systems integrating phonons with spins, expanding possibilities for quantum memory and error-corrected quantum processors.