Enhancement of Quantum Correlation Length in Quenched Disordered Spin Chains

Sadhukhan, Debasis ; Roy, Sudipto Singha ; Rakshit, Debraj ; Prabhu, R. ; Sen(De), Aditi ; Sen, Ujjwal (2016) Enhancement of Quantum Correlation Length in Quenched Disordered Spin Chains Physical Review E, 93 (1).

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Official URL: https://doi.org/10.1103%2Fphysreve.93.012131

Abstract

Classical correlations of ground states typically decay exponentially and polynomially, respectively for gapped and gapless short-ranged quantum spin systems. In such systems, entanglement decays exponentially even at the quantum critical points. However, quantum discord, an information-theoretic quantum correlation measure, survives long lattice distances. We investigate the effects of quenched disorder on quantum correlation lengths of quenched averaged entanglement and quantum discord, in the anisotropic XY and XYZ spin glass and random field chains. We find that there is virtually neither reduction nor enhancement in entanglement length while quantum discord length increases significantly with the introduction of the quenched disorder.

Item Type:Article
ID Code:125794
Deposited On:12 Oct 2022 10:34
Last Modified:12 Oct 2022 10:34

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