Amplification of quantum discord between two uncoupled qubits in a common environment by phase decoherence

Abstract

We study analytically the dynamic behaviors of quantum correlation measured by quantum discord between two uncoupled qubits, which are immersed in a common Ohmic environment. We show that the quantum discord of the two noninteracting qubits can be greatly amplified or protected for certain initially prepared $X$-type states in the time evolution. Especially, it is found that there does exist the stable amplification of the quantum discord for the case of two identical qubits, and the quantum discord can be protected for the case of two different qubits with a large detuning. It is also indicated that in general there does exist a sudden change of the quantum discord in the time evolution at a critic time point $t_c$, and the discord amplification and protection may occur only in the time interval $0<t\le t_c$ for certain $X$-type states. This sheds new light on the creation and protection of quantum correlation.

8 pages, 6 figures

References in corpus (21)

• Finite-Time Disentanglement via Spontaneous Emission
• Quantum discord and the power of one qubit
• Sudden Death of Entanglement
• Experimental quantum computing without entanglement
• Quantum discord for two-qubit X-states
• Non-Markovian effects on the dynamics of entanglement
• On the quantum, classical and total amount of correlations in a quantum state
• Robustness of quantum discord to sudden death
• Sudden transition between classical and quantum decoherence
• Classical and quantum correlations under decoherence
• Protecting entanglement via the quantum Zeno effect
• No-local-broadcasting theorem for quantum correlations
• Quantum discord and quantum phase transition in spin chains
• Sudden Birth Versus Sudden Death of Entanglement in Multipartite Systems
• Heralded Entanglement between Atomic Ensembles: Preparation, Decoherence, and Scaling
• Vanishing quantum discord is necessary and sufficient for completely positive maps
• Completely Positive Maps and Classical Correlations
• Quantum mutual information and the one-time pad
• Quantum Correlation Without Classical Correlations
• Broadcast copies reveal the quantumness of correlations
• An additive and operational entanglement measure: conditional entanglement of mutual information

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• Creating quantum correlations through local non-unitary memoryless channels
• Correlation Dynamics of Qubit-Qutrit Systems in a Classical Dephasing Environment
• Decoherence and the Nature of System-Environment Correlations
• Dephasing-assisted parameter estimation in the presence of dynamical decoupling
• Quantum discord amplification induced by quantum phase transition via a cavity-Bose-Einstein-condensate system
• Controlling decoherence speed limit of a single impurity atom in a Bose-Einstein-condensate reservoir
• Quantum Correlations Between Identical and Unidentical Atoms in a Dissipative Environment
• Various Correlations in Anisotropic Heisenberg XYZ Model with Dzyaloshinski-Moriya Interaction
• Entanglement Dynamics for Two Spins in an Optical Cavity---Field Interaction Induced Decoherence and Coherence Revival
• The sudden change phenomenon of quantum discord
• Controllable coupling and quantum correlation dynamics of two double quantum dots coupled via a transmission line resonator
• Dynamics of tripartite correlations for three qubits in independent thermal reservoirs
• Quantum Correlation Dynamics for an Open Multi Qutrit System