Nonperturbative cavity/waveguide quantum electrodynamics and dissipative quantum phase transition
- 2022年3月10日(木)13:30 - 15:00 (JST)
- 蘆田 祐人 (東京大学 大学院理学系研究科 准教授)
- via Zoom
Strong coupling between matter and quantized electromagnetic modes in cavity or waveguide may offer yet another approach of controlling equilibrium phases or dynamics of many-body systems. Recent developments have realized such strong light-matter interaction in genuinely quantum and nonperturbative regimes, where conventional approximate theoretical methods cannot be applied in general. I will talk about how one can analyze strongly coupled quantum light-matter systems at arbitrary interaction strengths on the basis of an asymptotically disentangling unitary transformation [1,2]. I discuss its application to construction of tight-binding Hamiltonians, dynamics of bound states in the continuum, and revisiting dissipative quantum phase transition in resistively shunted Josephson junctions .
*If you would like to participate, please contact Hidetoshi Taya.
- Y. Ashida, A. Imamoglu and E. Demler, Cavity Quantum Electrodynamics at Arbitrary Light-Matter Coupling Strengths, Phys. Rev. Lett (2021), doi: 10.1103/PhysRevLett.126.153603
- Yuto Ashida, Takeru Yokota, Atac Imamoglu, Eugene Demler, Nonperturbative Waveguide Quantum Electrodynamics, arXiv: 2105.08833
- K. Masuki, H. Sudo, M. Oshikawa and Y. Ashida, Absence versus Presence of Dissipative Quantum Phase Transition in Josephson Junctions, arXiv: 2111.13710