User:Jamiemjamie/Off-Diagonal Long-Range Order

Off-Diagonal Long-Range Order (ODLRO) is a concept used to describe macroscopic quantum coherent systems such as superfluids and superconductors. First introduce by Oliver Penrose in 1951[1], it emphasises that the observed long-range order in such systems is due to off-diagonal elements of the density matrix.

Formulation and meaning

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References

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  1. ^ Penrose, O. (1951-12-01). "CXXXVI. On the quantum mechanics of helium II". The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science. 42 (335): 1373–1377. doi:10.1080/14786445108560954. ISSN 1941-5982.