Estimation of Quantum Correlations in Two-Qubit NMR systems

Details Estimation of Quantum Correlations in Two-Qubit NMR systems Estimation of Quantum Correlations in Two-Qubit NMR systems

2012-03-08

arxiv.org/abs/1203.1756v1

Physics

Quantum Physics

8 pages, 7 figures

Scientific paper

We study evolution of quantum correlations in ensembles of two-qubit nuclear spin systems via nuclear magnetic resonance techniques. We use discord as a measure of quantum correlations and the Werner state as an explicit example. We first introduce different ways of measuring discord and geometric discord in two-qubit systems, and then we describe (a) quantitative measurement of discord for Werner-like states prepared using an entangling pulse sequence, (b) the efficiency of dynamical decoupling sequences in preserving quantum correlations, and (c) the evolution of discord for a singlet-triplet mixed state during a radio-frequency spin-lock.

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