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Abstract
We study the evolution of quantum correlations, quantified by the geometric discord, of two excitonic quantum-dot qubits under the influence of the phonon environment. We show that the decay of these correlations differs substantially from the decay of entanglement. Instead of displaying sudden-death-type behavior, the geometric discord shows a tendency to undergo transitions between different types of decay, is sensitive to nonlocal phase factors, and may already be enhanced by weak environment-mediated interactions. Hence, two-qubit quantum correlations are more robust under decoherence processes, while showing a richer and more complex spectrum of behavior under unitary and nonunitary evolution
Authors (3)
-
Katarzyna Roszak
- Wrocław University of Technology Institute of Physics
-
Paweł Mazurek
- University of Gdańsk Institute for Theoretical Physics and Astrophysics
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- Accepted or Published Version
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- Copyright (2013 American Physical Society)
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- Category:
- Articles
- Type:
- artykuł w czasopiśmie wyróżnionym w JCR
- Published in:
-
PHYSICAL REVIEW A
no. 87,
edition 6,
pages 1 - 5,
ISSN: 2469-9926 - Language:
- English
- Publication year:
- 2013
- Bibliographic description:
- Roszak k., Mazurek P., Horodecki P.: Anomalous decay of quantum correlations of quantum-dot qubits// PHYSICAL REVIEW A. -Vol. 87, iss. 6 (2013), s.1-5
- Verified by:
- Gdańsk University of Technology
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