Classical and quantum correlations under decoherence

Abstract

Recently some authors have pointed out that there exist nonclassical correlations which are more general, and possibly more fundamental, than entanglement. For these general quantum correlations and their classical counterparts, under the action of decoherence, we identify three general types of dynamics that include a peculiar sudden change in their decay rates. We show that, under suitable conditions, the classical correlation is unaffected by decoherence. Such dynamic behavior suggests an operational measure of both classical and quantum correlations that can be computed without any extremization procedure.

Published version

References in corpus (12)

• Finite-Time Disentanglement via Spontaneous Emission
• Sudden Death of Entanglement
• Experimental quantum computing without entanglement
• On the quantum, classical and total amount of correlations in a quantum state
• Robustness of quantum discord to sudden death
• No-local-broadcasting theorem for quantum correlations
• Quantum discord and quantum phase transition in spin chains
• Experimental investigation of the dynamics of entanglement: Sudden death, complementarity, and continuous monitoring of the environment
• Direct measurement of finite-time disentanglement induced by a reservoir
• Quantum Correlation Without Classical Correlations
• Broadcast copies reveal the quantumness of correlations
• An additive and operational entanglement measure: conditional entanglement of mutual information