The limits of counterfactual computation

Details The limits of counterfactual computation The limits of counterfactual computation

2006-06-10

arxiv.org/abs/quant-ph/0606092v3

Physics

Quantum Physics

Hosten et al. have responded to the second version of this paper, and the present version includes our reply to them. The text

Scientific paper

We show that the protocol recently proposed by Hosten et al. does not allow all possible results of a computation to be obtained counterfactually, as was claimed. It only gives a counterfactual outcome for one of the computer outputs. However, we confirm the observation that the protocol gives some protection against decoherence. In some situations, though, it may be more effective simply to run the computer several times.

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