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By Campana F.

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Details in this regard can be found in Holland, where an account of the de Broglie-Bohm causal approach to Quantum Mechanics is presented. In view of this historical background, the effect of Bell’s inequalities is often wrongly interpreted as proving that a deterministic hidden variable theory which is subjected to the principle of locality is not possible. However, it is important to note that such a view of Bell’s inequalities is not correct. Indeed, by giving up determinism, or the hidden variables, one still remains with Bell’s inequalities, since these inequalities only assume a classical framework in which the locality principle holds.

Xn |2 . 11) will collapse onto the corresponding state | x1 , . . , xn >. 11) will end. 12), it is often that such a probability |αx1 , . . , xn |2 is small. Practical Remark In view of the above, when setting up algorithms for quantum computers, it is useful to avoid an early loss of superposition. This therefore means avoiding an early measurement. As far as enhancing the probability of the results of measurements, this can be obtained by a judicious choice of quantum gates, that is, of unitary operators acting on multiple qubits.

Indeed, they allow the use of very simple quantum gates when building up more complex quantum algorithms. Also, they may allow a convenient architecture when building effective physically realized quantum computers. Chapter 3 Two Strange Phenomena We present next two novel and typical quantum computation phenomena. It is useful to encounter them early in the study of quantum computation, since they can give an instructive insight into how much different quantum computers are from the usual electronic digital ones.

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