Quantum speed limit for physical processes

The evaluation of the minimal evolution time between two distinguishable states of a system is important for assessing the maximal speed of quantum computers and communication channels. Lower bounds for this minimal time have been proposed for unitary dynamics. Here we show that it is possible to ex...

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Bibliographic Details
Published in:Physical review letters 2013-02, Vol.110 (5), p.050402-050402, Article 050402
Main Authors: Taddei, M M, Escher, B M, Davidovich, L, de Matos Filho, R L
Format: Article
Language:English
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Summary:The evaluation of the minimal evolution time between two distinguishable states of a system is important for assessing the maximal speed of quantum computers and communication channels. Lower bounds for this minimal time have been proposed for unitary dynamics. Here we show that it is possible to extend this concept to nonunitary processes, using an attainable lower bound that is connected to the quantum Fisher information for time estimation. This result is used to delimit the minimal evolution time for typical noisy channels.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.110.050402