What Does ODLRO Stand For?

ODLRO stands for Off Diagonal Long Range Order

ODLRO, or Off Diagonal Long Range Order, refers to a phenomenon in quantum mechanics and condensed matter physics where a system exhibits correlations in its properties between distant parts, despite being in a disordered state. This concept is particularly relevant in the study of systems such as superconductors and Bose-Einstein condensates, where macroscopic quantum coherence can occur. ODLRO highlights the significance of long-range correlations that exist off the diagonal in the density matrix, indicating a non-local order parameter that characterizes these states of matter.