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Without loss of generality, we also set some random parameters in the network. First, we randomly select an initial fidelity from a Gaussian distribution N = (0.8, 0.03^2) for each edge and assume the fidelity of multiple entangled pairs generated along the same edge to be identical. Then we defined a random request generator, which simulates a request flow following a Poisson distribution with a mean inter-arrival time of 50ms. Each request in the flow has random, non-adjacent source and destination nodes. Except for entanglement establishment and entanglement swapping, necessary entanglement purification on a single link is engaged based on the end-to-end fidelity calculation model in [12] to ensure that the final entanglement¡¯s fidelity is above 0.5.
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