Computing in the Presence of Uncertainty: Disturbing the Peace

Are there computations whose characteristics are akin to certain unique phenomena that are witnessed in di erent domains of science? We are particularly interested in systems whose parameters are altered unpredictably whenever one of these parameters is measured or modied. For example, is there a computational environment in which the uncertainty principle of digital signal processing and Le Châtelier's principle of chemical systems in equilibrium are manifested simultaneously? A positive answer might uncover computations that are inherently parallel in the strong sense, meaning that they are eÆciently executed in parallel, but impossible to carry out sequentially.