Team Leader, Quantum Many-Body Dynamics Research Team
In this research unit, we investigate non-equilibrium dynamics of quantum many-body systems using ultracold atomic gases. Advantages of ultracold-atom experiments are simplicity and excellent controllability of the parameters, including dimensions, of the systems. Especially, a quantum gas loaded into periodic potential generated by a laser (optical lattice) can mimic fundamental models in the strongly correlated physics, and it can be used as a platform for quantum information processing. Utilizing such systems, we investigate real-time and real-space dynamics, and also control the many-body dynamics.
・Research of non-equilibrium dynamics with quantum gases in optical lattices
・Research of frustrated quantum magnetism by using a triangular optical lattice system
・Automatic optimization of cold-atom experiments using machine learning
Representative Research Results
・“Single-site-resolved imaging of ultracold atoms in a triangular optical lattice”
Ryuta Yamamoto, Hideki Ozawa, David Can Nak, Ippei Nakamura, and Takeshi Fukuhara
New Journal of Physics 22, 123028 (2020).
・“Non-standard trajectories found by machine learning for evaporative cooling of 87Rb atoms”
Ippei Nakamura, Atsunori Kanemura, Takumi Nakaso, Ryuta Yamamoto, and Takeshi Fukuhara
Optics Express 27, 20435-20443 (2019).
・“Spatially Resolved Detection of a Spin-Entanglement Wave in a Bose-Hubbard Chain”
Takeshi Fukuhara, Sebastian Hild, Johannes Zeiher, Peter Schauß, Immanuel Bloch, Manuel
Endres, and Christian Gross
Physical Review Letters 115, 035302 (2015).
RIKEN RESEARCH （ https://www.riken.jp/en/news_pubs/research_news/rr/8116/ ）
・“Microscopic observation of magnon bound states and their dynamics”
Takeshi Fukuhara, Peter Schauß, Manuel Endres, Sebastian Hild, Marc Cheneau, Immanuel
Bloch, and Christian Gross
Nature 502, 76-79 (2013).
・“Quantum dynamics of a mobile spin impurity”
Takeshi Fukuhara, Adrian Kantian, Manuel Endres, Marc Cheneau, Peter Schauß, Sebastian Hild,
David Bellem, Ulrich Schollwöck, Thierry Giamarchi, Christian Gross, Immanuel Bloch, and
Nature Physics 9, 235-241 (2013).
Single-site-resolved imaging of ultracold atoms in a triangular optical lattice
Evaporation trajectory obtained by Bayesian optimization. Different color corresponds to different optimization sets. The dashed line shows the manually-optimized trajectory.