Preparation of Arbitrary Four-Qubit W State with Atomic Ensembles via Rydberg Blockade

• Published in: Chinese physics letters Vol. 27; no. 4; pp. 33 - 36
• Main Author: 韩阳 吴春旺 高明 梁林梅 陈平形 李承祖
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.04.2010
• Subjects: Blocking; Clusters; Entangled states; Noise; Nuclear power generation; Tasks; 量子信息处理; 量子比特; 非最大纠缠态
• ISSN: 0256-307X; 1741-3540
• DOI: 10.1088/0256-307X/27/4/040307

The generation of various entangled states is an essential task in quantum information processing. Recently, a scheme （PRA 79, 022304） has been suggested for generating Greenberger-Horne-Zeilinger state and cluster state with atomic ensembles based on the Rydberg blockade. Using similar resources as the earlier scheme, here we propose an experimentally feasible scheme of preparing arbitrary four-qubit W class of maximally and non- maximally entangled states with atomic ensembles in a single step. Moreover, we carefully analyze the realistic noises and predict that four-qubit W states can be produced with high fidelity （F - 0.994） via our scheme.