The Entanglement of quantum systems is a key aspect in order to understand the dynamics and behavior of mixed
systems (density matrix) as bipartite systems of quantum bits (q-bits). A quantifiable measure widely used is the
"entanglement of formation" of a mixed state, defined as the minimum number of singlets needed to create an ensemble
of pure states that represents the density matrix of the system. Considering a double quantum dot system coupled cavity
type Jaynes-Cummings investigate the entanglement between two quantum dots, immersed each in its own cavity,
showing analytically that entanglement has a very interesting effects such as temporal evolution including the so-called
sudden death effect.
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