基于量子非破坏测量的低纠缠三光子W态的超纠缠浓缩OA

Maximally entangled quantum states can serve as quantum transmission channels to ensure high fidelity in information transfer.However,during the storage and transmission of quantum communication,the two-particle maximum quantum entangled state shared by remote parties will be affected by noise environment,resulting in a reduction in the entanglement quality of the quantum state.And the maximum entangled state will degenerate into a partially entangled state,thereby affecting the fidelity of the transmitted information.To address this issue,this paper proposes a method based on entanglement concentration.This method utilizes quantum non-demolition photon number measurements combined with simple linear optical elements to concentrate an arbitrary low-entanglement hyperentangled three-photon W state into a maximally entangled hyperentangled state.The results show that the entanglement concentration scheme reduces the consumption of quantum resources to a certain extent while also lowering the experimental difficulty,showing a potential in practical applications.