Quantum Physics

    

Disproof of the no-Communication Theorem by Decoherence Theory

Authors: Remi Cornwall

The No-communication Theorem has been seen as the bar to communication by quantum state collapse. The essence of this theory is the procedure of taking the partial trace on an entangled, hence inseparable multi-particle system. This mathematical procedure applied unthinkingly, strikes out the off-diagonal elements from the ensemble density matrix and renders the reduced trace matrix representative of a mixed state. Decoherence theory is able to justify this mathematical procedure and we review it to show: the partial trace results for both unitary and non-unitary processes (hence measurement) on one, several or all particles of the ensemble; and that a unitary process keeps interference terms in the trace reduced matrix.

Comments: Slight correction to wording on the bottom of left column, page 3.

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Submission history

[v1] 2015-06-08 14:58:01
[v2] 2015-10-07 08:15:28

Unique-IP document downloads: 1697 times

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