“Does life in some way make use of the potentiality for vast quantum superpositions, as would be required for serious quantum computation?”

— Roger Penrose

Foreword (March 2007) to Quantum Aspects of Life (2008), by Derek Abbott.
Context: Does life in some way make use of the potentiality for vast quantum superpositions, as would be required for serious quantum computation? How important are the quantum aspects of DNA molecules? Are cellular microtubules performing some essential quantum roles? Are the subtleties of quantum field theory important to biology? Shall we gain needed insights from the study of quantum toy models? Do we really need to move forward to radical new theories of physical reality, as I myself believe, before the more subtle issues of biology — most importantly conscious mentality — can be understood in physical terms? How relevant, indeed, is our present lack of understanding of physics at the quantum/classical boundary? Or is consciousness really “no big deal,” as has sometimes been expressed?
It would be too optimistic to expect to find definitive answers to all these questions, at our present state of knowledge, but there is much scope for healthy debate...

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Roger Penrose15

English mathematical physicist, recreational mathematician … 1931

David Kaiser (1971) American physicist

Turning physicists into quantum mechanics (2007)

“If quantum communication and quantum computation are to flourish, a new information theory will have to be developed.”

Hans Christian von Baeyer (1938) American physicist

Source: Information, The New Language of Science (2003), Chapter 25, Zeilingers Principle, Information at the root of reality, p. 231

“Quantum computation is … nothing less than a distinctly new way of harnessing nature”

David Deutsch book The Fabric of Reality

Source: The Fabric of Reality (1997), Ch. 9 : Quantum Computers
Context: Quantum computation is … nothing less than a distinctly new way of harnessing nature … It will be the first technology that allows useful tasks to be performed in collaboration between parallel universes, and then sharing the results.

“This is used by some to state that no additional interpretation prescriptions for quantum mechanics are necessary. Yet we insist that the axioms for any "complete" quantum theory for the entire cosmos would present us with as yet unresolved paradoxes.”

Gerardus 't Hooft (1946) Dutch theoretical physicist and Nobel Prize winner

Context: The usual no-go theorems telling us that hidden variables are irreconcilable with locality, appear to start with fairly conventional pictures of particle systems, detectors, space and time. Usually, it is taken for granted that events at one place in the universe can be described independently from what happens elsewhere. Perhaps one has to search for descriptions where the situation is more complex. Maybe, it needs not be half as complex as superstring theory itself. The conventional Copenhagen interpretation of quantum mechanics suffices to answer all practical questions concerning conventional experiments with quantum mechanics, and the outcome of experiments such as that of Aspect et al can be precisely predicted by conventional quantum mechanics. This is used by some to state that no additional interpretation prescriptions for quantum mechanics are necessary. Yet we insist that the axioms for any "complete" quantum theory for the entire cosmos would present us with as yet unresolved paradoxes.<br><br> Obstacles on the Way toward the Quantization of Space, Time and Matter — and possible resolutions — http://www.staff.science.uu.nl/~hooft101/gthpub/foundations.pdf