Robustness of Quantum Discord Between Two Noninteracting Qubits in Spin-Star Baths
Journal Article
·
· Journal of Low Temperature Physics
- Hunan First Normal University, School of Mathematics and Computational Sciences (China)
We study the dynamics of quantum entanglement and discord between two noninteracting qubits, which couple with spin-star baths, obeying the XY Hamiltonian. We compare the dynamics of quantum discord with that of quantum entanglement. For the initial X-type state, in the common spin bath, the quantum discord is more robust than quantum entanglement. It is found that quantum discord of the two noninteracting qubits can be amplified, even in the regimes where entanglement suddenly disappears. This also points to a fact that the absence of entanglement does not necessarily indicate the absence of quantum correlations.
- OSTI ID:
- 22810147
- Journal Information:
- Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 3-4 Vol. 191; ISSN JLTPAC; ISSN 0022-2291
- Country of Publication:
- United States
- Language:
- English
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