What is EPR?

EPR can refer to several technologies, making it ambiguous without further context. It commonly refers to Electron Paramagnetic Resonance (also known as Electron Spin Resonance or ESR), a spectroscopic technique that detects species with unpaired electrons, such as free radicals, transition metal complexes, and defects in materials. It is used in chemistry, physics, biology, and materials science to study the electronic structure and dynamics of these paramagnetic species. It can also refer to 'Entanglement-Preserving Rebit Protocol' in the realm of quantum computing which is a method to transfer quantum data.