2025-04-11 理化学研究所,クオンティニュアム株式会社,慶應義塾大学
＜関連情報＞
- https://www.riken.jp/press/2025/20250411_1/index.html
- https://journals.aps.org/prresearch/abstract/10.1103/PhysRevResearch.7.023032
捕捉イオン量子コンピュータにおけるフローケ・スクランブル回路のシミュレーション Simulating Floquet scrambling circuits on trapped-ion quantum computers
Kazuhiro Seki, Yuta Kikuchi, Tomoya Hayata, and Seiji Yunoki
Physical Review Research Published 10 April, 2025
DOI: https://doi.org/10.1103/PhysRevResearch.7.023032
Abstract
Complex quantum many-body dynamics spread initially localized quantum information across the entire system. Information scrambling refers to such a process whose simulation is one of the promising applications of quantum computing. We demonstrate the Hayden-Preskill recovery protocol and the interferometric protocol for calculating out-of-time-ordered correlators to study the scrambling property of a one-dimensional kicked-Ising model on 20-qubit trapped-ion quantum processors. The simulated quantum circuits have a geometrically local structure that exhibits the ballistic growth of entanglement, resulting in the circuit depth being linear in the number of qubits for the entire state to be scrambled. We experimentally confirm the growth of signals in the Hayden-Preskill recovery protocol and the decay of out-of-time-ordered correlators at late times. As an application of the created scrambling circuits, we also experimentally demonstrate the calculation of the microcanonical expectation values of local operators adopting the idea of thermal pure quantum states. Our experiments are made possible by extensively utilizing one of the highest-fidelity quantum processors currently available and, thus, should be considered as a benchmark for the current status of the most advanced quantum computers.
