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We propose three effective protocols to generate four-qubit entangled decoherence-free states assisted by the cavity-QED system. These schemes are based on optical selection rules realized with a single electron charged self-assembled GaAs/InAs quantum dot in a micropillar resonator. Compared with previous photonic protocols, the first scheme is to replace the entangled-state resources with much simpler...
Using local operations and classical communication two remote participants may transform one shared entanglement to other form. In this paper, we evaluate its success probability for arbitrary initial entanglement and final entanglement by using the majorization condition and solving an equivalent nonlinear optimization problem. The optimal probability is determined by their entanglement coefficients...
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