High-efficiency atomic entanglement concentration for quantum communication network assisted by cavity QED

摘要: Quantum entanglement is the key resource in quantum information processing, especially communication network. However, affected by environment noise, maximally entangled states usually collapse into nonmaximally ones or even mixed states. Here we present two high-efficiency schemes to complete concentration of nonlocal two-atom systems. Our first scheme used concentrate atomic systems partially with known parameters, and it has optimal success probability. The second unknown parameters. Compared other for systems, our protocols are more efficient practical. They require only an ancillary single photon judge whether they succeed not, work a heralded way detection inefficiency absence sophisticated single-photon detectors practical applications. Moreover, insensitive both cavity decay spontaneous emission.