- Bose-Einstein condensation, Fermionic superfluidity, cold molecules
- Mesurement theory
- Quantum information, quantum control
With recent advances in nanoscience, it has become possible to precisely measure and control
atoms, molecules, and photons at the level of a single quantum.
We are interested in theoretically studying emergent quantum many-body problems in such highly controllable systems
and developing nanoscale thermodynamics and statistical physics that lay the foundations of such problems.
Our particular focuses in recent years include many-body physics of ultracold atomic gases and
unification of quantum and statistical physics and information theory.
Atomic gases which are cooled down to nearly zero temperature by laser cooling techniques
offer unique opportunities for studying macroscopic quantum phenomena such as a Bose-Einstein condensation (BEC) in controlled manners.
Unprecedented controllability of such gases also enables us to simulate phenomena analogous to condensed matter and astronomical physics,
to investigate their universal properties, and to explore unknown quantum many-body physics.
In our recent works, we have studied topological excitations and correlation effects in spinor BECs,
BCS-BEC crossover and Efimov physics under the control of an atomic interaction strength,
quantum Hall states in synthetic gauge fields,
and thermalization of isolated quantum systems.
We are also interested in relating fundamental concepts of quantum and statistical physics with information theory
and exploring interdisciplinary fields that unify physics and information.
In particular, we have recently worked on generalizations of the second law of thermodynamics and fluctuation theorems
and the formulation of the dynamics of state reduction in light of information flow under measurements and feedback controls.
PDF files (Japanese/English):
Link to the annual reports of the department