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Multi-photon entanglement has been successfully made by experimental groups.As the increase of photon number, several problems are encountered, say,greater number of copies, longer time, the error of fidelity and so on. In thispaper, we present a new scheme based on Lagrange multiplier and feedback tosave the measure copies in multi-photon experiment and five percent ofmeasuring time, also guarantee the acceptable error of fidelity. All theresults have been supported by the data of eight photon experiment.Furthermore, same approach is applied in the simulation for ten photonentanglement, and 22.45 percent of copies are saved, optimized copydistribution gives better estimation of fidelity than the average copydistribution.

Minimum Number of Copies in the Measurement of Multi-Photon Entanglement