Optimal Entanglement Concentration of the Greenberger-Horne-Zeilinger States in Quantum-dot and Micro-cavity Coupled System

摘要: The distillation of the triplet Greenberger-Horne-Zeilinger (GHZ) state is demonstrated by using entanglement concentrating process for partially electron-spin-entangled systems. We designate an concentration protocol (ECP) in quantum-dot (QD) and micro-cavity coupled systems based on post-selection, from which entangled can be concentrated with aid ancillary QD single photon. This repeated several rounds to get optimal success probability. With current technology, maximally electron spins achieved GHZ states after performing some suitable unitary operation locally long-distance quantum communications. advantage that during whole only photon needs pass through increases total probability even if cavity imperfect implementations.