Entanglement Dynamics and Applications Out of Thermal Equilibrium

Abstract

Entanglement is a paramount attribute, used as a resource for several quantum applica tions. However, the desire to nip disentanglement in the bud is the topic to conversation among researchers. In this work, the creation of entanglement and steady state concur rence is reviewed for the quantum system out of thermal equilibrium and further the finite-time disentanglement is examined. To this aim, the Markovian master equation approach is employed to find the rate equations and Wootter’s concurrence to analyze out-of-thermal equilibrium entanglement dynamics for coupled basis. The effect of super- and sub-radiant rates on entanglement sudden death is examined for different classes of X-states. It is found that the shorter dark period is achieved at a higher transition rate of a super-radiant state. Further the potentiality of superdense coding is examined and the dependence of superdense coding capacity on initial states for different ratios of sub- to super-radiant transition rates. The validity of dense coding is also analyzed for different probability amplitudes and it is perceived that maximally entangled states show the highest degree of coding capacity. This approach further allows us to analyze the applications of quantum information technologies