Takeshi Fukuhara

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 Theme

・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
Stefan Kuhr
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.

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