Deterministic entanglement purification and complete nonlocal Bell-state analysis with hyperentanglement

By Yu‐Bo Sheng, Fuguo Deng. 2009

346 citations recorded by the source corpus.

Entanglement purification is a very important element for long-distance quantum communication. Different from all the existing entanglement purification protocols (EPPs) in which two parties can only obtain 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. Using this protocl, the two parties can, in principle, obtain deterministically maximally entangled pure states in polarization without destroying any less-entangled 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. We also discuss this EPP in a practical transmission.

View Paper: https://www.semanticscholar.org/paper/d771a1a0596ee4d7353db9f219040ca721c89836