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Deterministic entanglement purification and complete nonlocal Bell-state analysis with hyperentanglement
Yu-Bo Sheng, Fu-Guo Deng
Abstract: Entanglement purification is a very important element for long-distance quantum communication. Different from all the existing entanglement purification protocols (EPPs) in which the two parties can only get some quantum systems in a mixed entangled state with a higher fidelity probabilistically by consuming quantum resources exponentially, here we present a deterministic EPP with hyperentanglement. The two parties can get deterministically maximally entangled pure states in polarization without destroying any less-entanglement photon pair, which will improve the efficiency of long-distance quantum communication exponentially. Meanwhile, it will be shown that this EPP can be used to complete nonlocal Bell-state analysis perfectly.