# Sudden Death of Entanglement of two Quantum Dots Embedded in its Own Cavity

### Authors: S. Sánchez-Sánchez, J.J. Sánchez Mondragón, F.R. Castillo Soria, V.I. Moreno Oliva, E. Román Hernández

*Research in Computing Science,* Vol. 131, pp. 93-109, 2017.

Abstract: Entanglement of quantum systems is a key aspect to understanding the dynamics and behavior of mixed systems (density matrix) as bipartite quantum bits (qubits). Thus we need to have a reliable and accurate way to measure the entanglement degree of the system, i.e., how it evolves, so that raises several approaches to meet these demands. A quantifiable measure widely used is the "entanglement of formation" of a mixed state, defined as the minimum number required of "singlets" to create a set of pure states that represents the density matrix of the system. In this paper we consider a system of two semiconductor quantum dots embedded in its own cavity and coupled to the internal mode field of cavity type Jaynes-Cummings. The entanglement between the two quantum dots is investigated, and we show analytically that entanglement has very interesting, effects such as time evolution including the effect called sudden death.

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