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Quantum Information Processing
Erschienen in: Quantum Information Processing 1/2014

01.01.2014

Violation of the “information–disturbance relationship” in finite-time quantum measurements

verfasst von: A. Thilagam

Erschienen in: Quantum Information Processing | Ausgabe 1/2014

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Abstract

The effect of measurement attributes (quantum level of precision, finite duration) on the classical and quantum correlations is analyzed for a pair of qubits immersed in a common reservoir. We show that the quantum discord is enhanced as the precision of the measuring instrument is increased, and both the classical correlation and the quantum discord experience noticeable changes during finite-time measurements performed on a neighboring partition of the entangled system. The implication of these results on the “information–disturbance relationship” is examined, with critical analysis of the delicate roles played by quantum non-locality and non-Markovian dynamics in the violation of this relationship, which appears surprisingly for a range of measurement attributes. This work highlights that the fundamental limits of quantum mechanical measurements can be altered by exchanges of non-classical correlations such as the quantum discord with external sources, which has relevance to cryptographic technology.
Vorheriger Artikel Cheat sensitive quantum bit commitment via pre- and post-selected quantum states

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Metadaten
Titel
Violation of the “information–disturbance relationship” in finite-time quantum measurements
verfasst von
A. Thilagam
Publikationsdatum
01.01.2014
Verlag
Springer US
Erschienen in
Quantum Information Processing / Ausgabe 1/2014
Print ISSN: 1570-0755
Elektronische ISSN: 1573-1332
DOI
https://doi.org/10.1007/s11128-013-0673-y

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