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On superluminal information transmission using quantum systems

Giovanni Andrea Fantasia

Published Jan 20, 2003• 0 citations
OpenAlex

Abstract

Abstract. In the present work we investigate the possibility of superluminal information transmission using quantum systems. We give a general argument to prove that local actions on general entangled system are not useful at the purpose. A protocol for superluminal information transmission that makes use of a kind of observables we have discovered is proposed.

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Abstract. In the present work we investigate the possibility of superluminal information transmission using quantum systems. We give a general argument to prove that local actions on general entangled system are not useful at the purpose. A protocol for superluminal information transmission that makes use of a kind of observables we have discovered is proposed.
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We show that nonlocality of quantum mechanics cannot lead to superluminal transmission of information, even if most general local operations are allowed, as long as they are linear and trace preserving. In particular, any quantum-mechanical approximate cloning transformation does not allow signaling. On the other hand, the no-signaling constraint on its own is not sufficient to prevent a transformation from surpassing the known cloning bounds. We illustrate these concepts on the basis of some examples.