We present a discussion of the fundamental loss of unitarity that appears in quantum mechanics due to the use of a physical apparatus to measure time. This induces a decoherence effect that is independent of any interaction with the environment and appears in addition to any usual environmental decoherence. The discussion is framed self consistently and aimed to general physicists. We derive the modified Schrödinger equation that arises in quantum mechanics with real clocks and discuss the theoretical and potential experimental implications of this process of decoherence. © 2007 Springer Science+Business Media, LLC.
Publication Source (Journal or Book title)
General Relativity and Gravitation
Gambini, R., Porto, R., & Pullin, J. (2007). Fundamental decoherence from quantum gravity: A pedagogical review. General Relativity and Gravitation, 39 (8), 1143-1156. https://doi.org/10.1007/s10714-007-0451-1