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Physics World

Theorist charts a deterministic future

Edwin Cartlidge

Published Nov 1, 2003• 0 citations
Publisher

Abstract

The idea of determinism has had a powerful grip on the imagination of physicists ever since Pierre Simon Laplace evoked the idea of the clockwork universe. When Einstein uttered his famous phrase God doesn't play dice, he was expressing his unhappiness with the probabilistic nature of quantum mechanics, believing that beneath quantum theory must lie a deeper, deterministic theory of nature. But such has been the huge success of quantum theory that most physicists now believe that the ultimate physical theory will be quantum mechanical and that nature is fundamentally random.

DOI
10.1088/2058-7058/16/11/22

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The idea of determinism has had a powerful grip on the imagination of physicists ever since Pierre Simon Laplace evoked the idea of the clockwork universe. When Einstein uttered his famous phrase God doesn't play dice, he was expressing his unhappiness with the probabilistic nature of quantum mechanics, believing that beneath quantum theory must lie a deeper, deterministic theory of nature. But such has been the huge success of quantum theory that most physicists now believe that the ultimate physical theory will be quantum mechanical and that nature is fundamentally random.
Now that we have defined, described, and tested random numbers, the question arises: do random numbers exist? Can true randomness occur in nature? Albert Einstein’s famous dictum “God does not play dice” – uttered about the then new-fangled theory of quantum mechanics and its inherent random nature – expressed his belief that everything is deterministic, that there is no true randomness in nature. Did the great physicist turn full circle to the early religious doctrines which claims that it is God’s finger that determines everything?
Albert Einstein's comment that ‘God does not play dice’ sums up the way many people react when they first encounter the ideas discussed in the previous chapters. How can it be that some future events are not completely determined by the way things are at present? How can a cause have two or more possible effects? If the choice of future events is not determined by natural laws does it mean that some supernatural force (God?) is involved wherever a quantum event occurs? Questions of this kind trouble many students of physics, though most get used to the conceptual problems, say ‘Nature is just like that’ and apply the ideas of quantum physics to their study or research without worrying about their fundamental truth or falsity. Some, however, never get used to the, at least apparent, contradictions. Others believe that the fundamental processes underlying the basic physics of the universe must be describable in deterministic, or at least realistic, terms and are therefore attracted by hidden-variable theories. Einstein was one of those. He stood out obstinately against the growing consensus of opinion in the 1920s and 30s that was prepared to accept indeterminism and the lack of objective realism as a price to be paid for a theory that was proving so successful in a wide variety of practical situations. Ironically, however, Einstein's greatest contribution to the field was not some subtle explanation of the underlying structure of quantum physics but the exposure of yet another surprising consequence of quantum theory.
Albert Einstein's comment that ‘God does not play dice’ sums up the way many people react when they first encounter the ideas discussed in the previous chapters. How can it be that some future events are not completely determined by the way things are at present? How can a cause have two or more possible effects? If the choice of future events is not determined by natural laws does it mean that some supernatural force (God?) is involved wherever a quantum event occurs? Questions of this kind trouble many students of physics, though most get used to the conceptual problems, say ‘Nature is just like that’ and apply the ideas of quantum physics to their study or research without worrying about their fundamental truth or falsity. Some, however, never get used to the, at least apparent, contradictions. Others believe that the fundamental processes underlying the basic physics of the universe must be describable in deterministic, or at least realistic, terms and are therefore attracted by hidden-variable theories. Einstein was one of those. He stood out obstinately against the growing consensus of opinion in the 1920s and 30s that was prepared to accept indeterminism and the lack of objective realism as a price to be paid for a theory that was proving so successful in a wide variety of practical situations. Ironically, however, Einstein's greatest contribution to the field was not some subtle explanation of the underlying structure of quantum physics but the exposure of yet another surprising consequence of quantum theory.
Abstract Quantum mechanics, like other enormously successful physical theories, accurately describes how the natural world behaves. Its explanatory powers regarding the indeterminate behavior of the smallest constituents of nature have proven to be both profound and practical. Many technological devices from lasers to computer chips are based on quantum mechanics. Not surprisingly, the universe filled with microscopic random events revealed by quantum mechanics has generated wonder and interpretive bewilderment. Reactions to the unsettling revelations of quantum unpredictability have included appeals to unknown variables to preserve classical physics, and even wholesale theoretical dismissals. Far from proof of mathematical trickery or theoretical incompletion however, the now well-established and irreducible quantum randomness suggests a physical universe that is open to a future not determined by the past, and perhaps to a God that really does play dice.
Einstein was one of the founders of quantum mechanics, yet he disliked the randomness that lies at the heart of the theory. God does not, he famously said, play dice. However, quantum theory has survived a century of experimental tests, although it has yet to be reconciled with another of Einstein's great discoveries – the general theory of relativity. Below four theorists – Gerard 't Hooft, Edward Witten, Fay Dowker and Paul Davies– outline their views on the current status of quantum theory and the way forward
Einstein initially objected to the probabilistic aspect of quantum mechanics— the idea that God is playing at dice. Later he changed his ground, and focussed instead on the point that the Copenhagen Interpretation leads to what Einstein saw as the abandonment of physical realism. We argue here that Einstein’s initial intuition was perfectly sound, and that it is precisely the fact that quantum mechanics is a fundamentally probabilistic theory which is at the root of all the controversies regarding its interpretation. Probability is an intrinsically logical concept. This means that the quantum state has an essentially logical significance. It is extremely difficult to reconcile that fact with Einstein’s belief, that it is the task of physics to give us a vision of the world apprehended sub specie aeternitatis. Quantum mechanics thus presents us with a simple choice: either to follow Einstein in looking for a theory which is not probabilistic at the fundamental level, or else to accept that physics does not in fact put us in the position of God looking down on things from above. There is a widespread fear that the latter alternative must inevitably lead to a greatly impoverished,