April 11, 2025
RIKEN
Quantinuum Ltd.
Keio University
A joint research group, consisting of Researcher Kazuhiro Seki of the Quantum Computational Science Research Team, RIKEN Center for Quantum Computing; Principal Investigator Kiyoshi C. Yuzuki of the Yuzuki Computational Condensed Matter Physics Laboratory, RIKEN Cluster for Pioneering Research (also Team Principal, Quantum Materials Science Research Team, RIKEN Center for Computational Science; Team Director, Quantum Computational Science Research Team, RIKEN Center for Quantum Computing; and Team Director, Computational Quantum Matter Research Team, RIKEN Center for Emergent Matter Science); Lead R&D Scientist Yuta Kikuchi of Quantinuum Ltd. (also a Visiting Researcher at the RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program); and Associate Professor Tomoya Hayata of the Keio University School of Medicine (also a Visiting Researcher at the RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program), has demonstrated using an ion-trap quantum computer that a state where quantum information is delocalized (a scrambled state) can be prepared using a quantum circuit that simulates a periodically driven system.
A scrambled state has properties that are expected to be useful for quantum information recovery and quantum many-body system calculations. This achievement, as an early-stage example of quantum computer use in the academic research field where physical phenomena and quantum information intersect, is expected to contribute to promoting the use of quantum computers in Japan.
In this study, the joint research group confirmed that the scrambled state, which has generally been discussed using quantum circuits with randomness, can also be prepared using a quantum circuit that simulates a periodically driven system. This was verified using an actual quantum computer capable of high-fidelity quantum operations, through a combination of appropriate error mitigation methods and theoretical considerations.
This research was published in the online edition of the scientific journal "Physical Review Research" on April 10.
For the full press release, please see below.