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The Discovery Of Physical Systems That Exhibit What We Now Call Quantum Mechanical Behaviour Was Unquestionably One Of The Most Astonishing Events Of Modern Physics. No Less Remarkable Was The Realisation That Quantum Mechanics Presents A Much More Powerful Paradigm For Computation And Information Processing Than Its Classical Counterpart. Indeed, Until That Point The Theory Of Computation Was Largely Treated As An Abstract Mathematical Topic, With Little Consideration Given To How The Mathematical Objects Being Studied Would Obtain Physical Reality. This Disposition Is Largely Appropriate When Said Mathematical Objects Are (classical) Bits And The Operations Thereupon, But Is Definitely Not Satisfactory When Considering The Computational Properties Of Quantum Systems. As One Of The Founding Fathers Of Quantum Computation, David Deutsch, Wrote The Theory Of Computation Has Traditionally Been Studied Almost Entirely In The Abstract, As A Topic In Pure Mathematics. This Is To Miss The Point Of It. Computers Are Physical Objects, And Computations Are Physical Processes. What Computers Can Or Cannot Compute Is Determined By The Laws Of Physics Alone, And Not By Pure Mathematics, The Essence Of Which Rolf Landauer, Distilled Into The Pithier Information Is Physical-- Provided By Publisher.