Fast Preparation of <i>W</i> States by Designing the Evolution Operators with Rydberg Superatom
W. Y. Zhang, Cai‐Qing Wang, Yan‐Qiang Ji, Qiu‐Ping Shao, Ji‐Ping Wang, J. Wang, Li‐Ping Yang, Li Dong, Xiao‐Ming Xiu
Abstract
Abstract W states play an important role in quantum information processing and quantum computing. Here, it proposes a scheme for preparing W states by designing the evolution operators with Rydberg superatoms. It encodes quantum information on the effective energy level of the superatom, and construct shortcuts to adiabatic passages (STAP) by designing the evolution operators. Combined with Quantum Zeno dynamics and STAP, it can prepare three‐particle W states quickly and efficiently. In addition, the Rabi frequency in this scheme can be described as a linear superposition of Gaussian functions, which reduces the difficulty of practical experiment. The numerical simulation shows that the scheme is robust against decoherence, operational imperfection, and noise. At last, it generalizes this scheme to preparation of N ‐particle W states.