Robustness of quantum discord to sudden death in NMR
Jianwei Xu, Qihui Chen
TL;DR
This paper studies how quantum discord and entanglement behave in NMR systems, revealing that quantum discord remains more robust than entanglement during relaxation processes.
Contribution
It demonstrates that quantum discord persists longer than entanglement under relaxation in NMR, highlighting its robustness in quantum information tasks.
Findings
Entanglement experiences sudden death and revival.
Quantum discord remains significant after entanglement vanishes.
Quantum discord exhibits oscillations but persists longer.
Abstract
We investigate the dynamics of entanglement and quantum discord of two qubits in liquid state homonuclear NMR. Applying a phenomenological description for NMR under relaxation process, and taking a group of typical parameters of NMR, we show that when a zero initial state experiences a relaxation process, its entanglement disappears completely after a sequence of so-called sudden deaths and revivals, while the quantum discord retains remarkable values after a sequence of oscillations. That is to say, the quantum discord is more robust than entanglement.
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Taxonomy
TopicsQuantum Information and Cryptography · Spectroscopy and Quantum Chemical Studies · Quantum Mechanics and Applications