A pedagogical overview of quantum discord
arXiv:1312.7676 · doi:10.1142/S123016121440006X
Abstract
Recent measures of nonclassical correlations are motivated by different notions of classicality and operational means. Quantum discord has received a great deal of attention in studies involving quantum computation, metrology, dynamics, many-body physics, and thermodynamics. In this article I show how quantum discord is different from quantum entanglement from a pedagogical point of view. I begin with a pedagogical introduction to quantum entanglement and quantum discord, followed by a historical review of quantum discord. Next, I give a novel definition of quantum discord in terms of any classically extractable information, a approach that is fitting for the current avenues of research. Lastly, I put forth several arguments for why discord is an interesting quantity to study and why it is of interest to so many researchers in the community.
17 pages, 6 figures, to appear in special OSID volume of on open systems
References in corpus (5)
Cited by in corpus (24)
- Measures and applications of quantum correlations
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- Quantum correlations in separable multi-mode states and in classically entangled light
- Discriminating Strength: a bona fide measure of non-classical correlations
- Equivalence of qubit-environment entanglement and discord generation via pure dephasing interactions and the consequences thereof
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- Quantum Correlation Dynamics in Controlled Two-Coupled-Qubit Systems
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- Robustness of quantum correlation in quantum energy teleportation
- Diagonal quantum discord
- A glimpse of objectivity in bipartite systems for non-entangling pure dephasing evolutions
- Complete positivity violation of the reduced dynamics in higher-order quantum adiabatic elimination
- Simple permutation-based measure of quantum correlations and maximally-3-tangled states
- Local, nonlocal quantumness and information theoretic measures
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- Estimating phase transition of perturbed J1-J2 Heisenberg quantum chain in mixtures of ground and first excited states
- Dephasing effects on quantum correlations and teleportation in presence of state dependent bath
- Quantum Correlations in NMR systems
- A signature of quantumness in pure decoherence control
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