Feynman, R., "Negative probability", in Quantum Implications---Essays in Honour of David Bohm (B. J. Hiley and F. D. Peat, editors), Routledge & Kegan Paul, London, 1987, pp. 235--248.  Home/Search   Document Not in Database   Summary   Related Articles

....[15] it is as if somehow or other it appears as if the probabilities would have to go negative . This is something that we do not know [ how to simulate classically, which would explain why the quantum computer is (perhaps) computationally more powerful than classical computers. Read [17] for Feynman s in depth and entertaining look at negative probabilities. Quantum interference can also work to reinforce probabilities rather than annihilating them: the probability of reaching final state x through intermediary states a and b note that we did not say a or b can be four times ....

Feynman, R., "Negative probability", in Quantum Implications---Essays in Honour of David Bohm (B. J. Hiley and F. D. Peat, editors), Routledge & Kegan Paul, London, 1987, pp. 235--248.

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