New Method for High-Fidelity Multiqubit Entanglement Generation in Quantum Systems

Recent advancements in quantum physics have led to a new method for generating multiqubit entanglement states using rapid adiabatic passage (RAP). This technique, proposed by Shijie Xu and colleagues, aims to enhance the fidelity and robustness of entangled states in Rydberg atom-array systems. The researchers demonstrated that by employing global and continuous driving laser fields, they could transform a product state in a multi-qubit system into an entangled state with high fidelity.

The study specifically showcases the generation of two-qubit Bell states and three-qubit W states through sequential RAP pulses within the Rydberg blockade regime. The authors predict that this method can achieve fidelities exceeding 0.9995 for both the two-qubit Bell state and the three-qubit W state. Furthermore, the approach is adaptable, allowing for the generation of entanglement between weakly coupled atoms and the creation of four-qubit Greenberger-Horne-Zeilinger states through spatial correlations.

This research holds significant implications for the field of quantum computing and quantum information processing. The ability to generate high-fidelity entangled states efficiently could pave the way for more robust quantum networks and enhance the performance of quantum algorithms. The method's potential for scalability to larger atomic arrays also suggests a promising avenue for future research in quantum technologies.

The findings are detailed in the paper titled "Efficient generation of multiqubit entanglement states using rapid adiabatic passage" by Shijie Xu, Xinwei Li, Xiangliang Li, Jinbin Li, and Ming Xue, available on arXiv under the identifier arXiv:2408.17048.