Programme

I.1 -- Invited, VCTP-44

Date: Monday, 29 July 2019

Time: 09:00 - 09:30

Weak-Strong Coupling Duality in the Cavity QED

Mahn-Soo Choi*

Department of Physics, Korea University, Seoul 02841, Korea, *E-mail: choims@korea.ac.kr

We reveal the duality in the Rabi Hamiltonian, which describes the various physical systems and phenomena. In particular, the superconducting circuit QED systems provide a wide range of scientific platforms from quantum computer to accurate quantum sensing of elementary charge or spin [5]. Further, due to its ultra-strong coupling constant, it has drawn a renewed interested in the Rabi Hamiltonian. In this talk, we reveal the duality in the Rabi Hamiltonian, where the weak and strong coupling regime are mathematically equivalent and related to each other by a unitary transformation. Several examples of the implications of the duality will be discussed including the ground-state squeezing [1,2], the Majorana bound states [3], and the photon localization-delocalization double transitions [4].
References
1. M.-J. Hwang , Mahn-Soo Choi, and Rosa Lopez, Phys. Rev. B 76, 165312 (2007).
2. M.-J. Hwang and Mahn-Soo Choi, Phys. Rev. A 82, 025802 (2010).
3. M.-J. M.-J. Hwang and Mahn-Soo Choi, Phys. Rev. B 87, 125404 (2013).
4. M.-J. Hwang, M. Kim, and Mahn-Soo Choi, Phys. Rev. Lett. 116, 153601 (2016).
5. M. M. Desjardins et al., Nature 545, 71 (2017).

Presenter: Mahn-Soo Choi