物理学报2025，Vol.74Issue(10)：59-67,9.DOI:10.7498/aps.74.20241694
基于超绝热技术快速制备里德伯超级原子W态
Rapid preparation of Rydberg superatom W state using superadiabatic techniques
摘要
Abstract
The W state,as a robust multipartite entangled state,plays an important role in quantum information processing,quantum network construction and quantum computing.In this paper,a three-level ladder-type Rydberg atomic system is placed into a Rydberg blocking sphere to form a superatom.Each superatom has many collective states including just one Rydberg excitation constrained by the Rydberg blockade effect.In the weak cavity field limit,at most one atom can be pumped into excited state,then we can describe the superatom by using a three-level ladder-type system.Afterwards we encode quantum information about the effective energy levels of Rydberg superatoms and propose a fast scheme for preparing the Rydberg superatom W state based on the superadiabatic iterative technique and quantum Zeno dynamics.This scheme can be achieved in only one step by controlling the laser pulses.In this scheme,the superatoms are trapped in spatially separated cavities connected by optical fibers,thereby greatly improving the feasibility of experimental manipulation.A remarkable feature is that it does not need to accurately control experimental parameters and interaction time.Meanwhile,the form of counterdiabatic Hamiltonian is the same as that of the effective Hamiltonian.Through numerical simulations,the fidelity of this scheme can reach 99.94％.Even considering decoherence effects,including atomic spontaneous emission and photon leakage,the fidelity can still exceed 97.5％,thereby further demonstrating the strong robustness of the solution.In addition,the Rabi frequency can be characterized as a linear superposition of Gaussian functions,and this representation significantly alleviates the complexity encountered in practical experiments.Futhermore,we also analyze the influence of parameter fluctuations on the fidelity,and the results show that this scheme is robust against parameter fluctuations.Finally,the present scheme is extended to the case of N Rydberg superatoms,which shows the scalability of our scheme.关键词
超绝热/W态/里德伯超级原子Key words
superadiabatic/W state/Rydberg superatoms引用本文复制引用
杨丽萍,王纪平,董莉,修晓明,计彦强..基于超绝热技术快速制备里德伯超级原子W态[J].物理学报,2025,74(10):59-67,9.基金项目
国家自然科学基金(批准号:11947078)、辽宁省自然科学基金(批准号:2020-BS-234)和辽宁省教育厅基本科研项目(批准号:LJ212410167045,LJKZ1015)资助的课题. Project supported by the National Natural Science Foundation of China(Grant No.11947078),the Natural Science Foundation of Liaoning Province,China(Grant No.2020-BS-234),and the Department of Education of Liaoning Province,China(Grant Nos.LJ212410167045,LJKZ1015). （批准号:11947078）
