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Biological information processing is generally assumed to be classical.Measured cellular energy budgets of both prokaryotes and eukaryotes, however,fall orders of magnitude short of the power required to maintain classicalstates of protein conformation and localization at the \AA, fs scales predictedby single-molecule decoherence calculations and assumed by classical moleculardynamics models. We suggest that decoherence is limited to the immediatesurroundings of the cell membrane and of intercompartmental boundaries withinthe cell, and that bulk cellular biochemistry implements quantum informationprocessing. Detection of Bell-inequality violations in responses toperturbation of recently-separated sister cells would provide a sensitive testof this prediction. If it is correct, modeling both intra- and intercellularcommunication requires quantum theory.

Metabolic limits on classical information processing by biological cells