Necessary and sufficient condition for nonzero quantum discord.
By B. Dakić, Vlatko Vedral, Č. Brukner. Physical Review Letters, 2010
1,031 citations recorded by the source corpus.
Quantum discord characterizes "nonclassicality" of correlations in quantum mechanics. It has been proposed as the key resource present in certain quantum communication tasks and quantum computational models without containing much entanglement. We obtain a necessary and sufficient condition for the existence of nonzero quantum discord for any dimensional bipartite states. This condition is easily experimentally implementable. Based on this, we propose a geometrical way of quantifying quantum discord. For two qubits this results in a closed form of expression for discord. We apply our results to the model of deterministic quantum computation with one qubit, showing that quantum discord is unlikely to be the reason behind its speedup.
Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics
View Paper: https://www.semanticscholar.org/paper/60e2989ff6978fc1ab0898831a06e85b894bae73
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In Artificial Intelligence
In Atomic and Molecular Physics, and Optics
Citations in the corpus
- Quantum coherence and geometric quantum discord (2017, methodology): “For the above fashion of DQC1, several works have been undertaken to understand the origin of its superiority over the classical algorithm (Dakić et al., 2010; Datta et al., 2008; Datta and Gharibian, 2009).”
- The classical-quantum boundary for correlations: Discord and related measures (2011, methodology): “This figure is reproduced from (Dakić et al., 2010). of (Modi et al., 2010).”