2023-10-06 ワシントン大学セントルイス校
◆物理学の研究者たちが、量子物理学の奇妙な現象である「量子もつれ」を早く形成する方法を見つけた。通常、量子もつれは理解が難しいが、新しいアプローチにより、もつれを加速できる可能性がある。この発見は、量子コンピュータなどの未来のテクノロジーに応用されるかもしれない。
＜関連情報＞
- https://source.wustl.edu/2023/10/speeding-up-creation-of-quantum-entanglement/
- https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.131.100202
高次例外点への近接による量子もつれ生成の高速化 Speeding Up Entanglement Generation by Proximity to Higher-Order Exceptional Points
Zeng-Zhao Li, Weijian Chen, Maryam Abbasi, Kater W. Murch, and K. Birgitta Whaley
Physical Review Letters Published 8 September 2023
DOI:https://doi.org/10.1103/PhysRevLett.131.100202
ABSTRACT
Entanglement is a key resource for quantum information technologies ranging from quantum sensing to quantum computing. Conventionally, the entanglement between two coupled qubits is established at the timescale of the inverse of the coupling strength. In this Letter, we study two weakly coupled non-Hermitian qubits and observe entanglement generation at a significantly shorter timescale by proximity to a higher-order exceptional point. We establish a non-Hermitian perturbation theory based on constructing a biorthogonal complete basis and further identify the optimal condition to obtain the maximally entangled state. Our study of speeding up entanglement generation in non-Hermitian quantum systems opens new avenues for harnessing coherent nonunitary dissipation for quantum technologies.
