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The 977th IMS colloquium

Lecture Title "Shaping the Hamiltonian of quantum many-body spin systems"
Date Wednesday 7 February 2024 16:00
Lecturer Prof. Matthias Weidemüller (Vice-Rector, Heidelberg University, Germany)
Place

Hybrid format (IMS Research Building Room 201 and Zoom)
*Zoom registration:

https://registration.ims.ac.jp/IMS_colloquium977/en

(Internal participants are encouraged to attend in person.)
Summary

Quantum simulation enables the investigation of simplified physical models that capture the fundamental aspects of complex quantum many-body systems. In order to understand how interaction parameters impact the macroscopic properties of the system, it is essential to modify the Hamiltonian in a controlled fashion. I will present novel approaches to perform tunable quantum simulations in an isolated many-body spin-1/2 system. Using electronically highly excited (Rydberg) atoms as a quantum simulator platform, these approaches are employed to study out-of-equilibrium quantum dynamics in different regimes. After a general introduction into the field, my talk will focus on two topics: (1) To introduce new effective interactions into the system, we employ a time-periodic drive to transform the natural dipolar interaction Hamiltonian into a defined target form. We demonstrate the potential of this Floquet Hamiltonian Engineering for tunable quantum simulation of Heisenberg spin models by altering symmetry and transport properties. (2) We devise and implement a protocol to fully reverse the dynamics of a quantum many-body spin system. The versatility of the approach is demonstrated by studying the many-body Loschmidt echo for a variety of Hamiltonians with tunable symmetry. In general, engineering a wide range of Hamiltonians opens up several new opportunities for investigating non-equilibrium dynamics in isolated spin systems ranging from transport and spin glasses to quantum thermalization.
Contact

Contact: Kenji Ohmori (Department of Photo-Molecular Science)

Hikaru Kuramochi & Yasutomo Segawa （IMS colloquium FY2023 committee）
Awards & Honors International collaboration

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