Robustness of quantum discord to sudden death

By T. Werlang, Simone Souza, Felipe Fernandes Fanchini, C. Boas. 2009

493 citations recorded by the source corpus.

We calculate the dissipative dynamics of two-qubit quantum discord under Markovian environments. We analyze various dissipative channels such as dephasing, depolarizing, and generalized amplitude damping, assuming independent perturbation, in which each qubit is coupled to its own channel. Choosing initial conditions that manifest the so-called sudden death of entanglement, we compare the dynamics of entanglement with that of quantum discord. We show that in all cases where entanglement suddenly disappears, quantum discord vanishes only in the asymptotic limit, behaving similarly to individual decoherence of the qubits, even at finite temperatures. Hence, quantum discord is more robust than the entanglement against decoherence so that quantum algorithms based only on quantum discord correlations may be more robust than those based on entanglement.

Subfields: Artificial Intelligence

View Paper: https://www.semanticscholar.org/paper/9c218150bd48d776ae4b54bd66551d9de334785f

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In Artificial Intelligence

1. Kavan Modi
2. Tomasz Paterek
3. H. Cable
4. Aharon Brodutch
5. Vlatko Vedral

Citations in the corpus

• The classical-quantum boundary for correlations: Discord and related measures (2011, background): “In the first study addressing this question, (Werlang et al., 2009) compare the evolution of concurrence and discord for two qubits, each subject to independent Markovian decoherence (dephasing, depolarizing and amplitude damping).”