Shared purity and concurrence of a mixture of ground and low-lying excited states as indicators of quantum phase transitions
George Biswas,
Anindya Biswas,
Ujjwal Sen
Abstract:We investigate the efficacy of shared purity, a measure of quantum correlation that is independent of the separability-entanglement paradigm, as a quantum phase transition indicator in comparison with concurrence, a bipartite entanglement measure. The order parameters are investigated for thermal states and pseudo-thermal states, of the systems considered. In the case of the one-dimensional J1 - J2 Heisenberg quantum spin model and the one-dimensional transverse-field quantum Ising model, shared purity turns out… Show more
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