Waveguide quantum optomechanics: PT phase transitions in the ultrastrong coupling regime | I. Iorsh
Dr. Ivan Iorsh, Theoretical Seminar at The Department of Physics & Engineering, ITMO | 05/13/2020
"Waveguide quantum optomechanics: parity-time phase transitions in the ultrastrong coupling regime"
Abstract: We show that the physics of waveguide quantum electrodynamics (QED) can be substantially enriched by the inclusion the qubit mechanical motion. Specifically, considering the simplest setup of a pair of harmonically trapped qubits over an optical waveguide, we reveal that the system enables the ultrastrong coupling regime of the quantum optomechanical interaction. Moreover, the combination of the inherent open nature of the system and the strong optomechanical coupling leads to the emergence of the parity-time phase transitions, an unconventional phenomenon in the purely quantum systems without artificially engineered gain and loss. Finally, we establish a link between our results and those of the classical waveguide optomechanics and discuss the emergent observable effects in the state-of-the-art waveguide QED set ups. Our findings shed light on the plethora of new physical phenomena in the optomechanics of waveguide QED and could be harnessed in the emerging quantum technologies.
0:00 Intro
00:00:33 Introduction
00:01:14 Optomechanics
00:04:24 Going quantum (still many directions) - quantizing EM field
00:04:43 Question by Dr. Mihail Petrov
00:05:21 Question by Dr. Andrey Bogdanov
00:07:26 Question by Mr. Shahab Ramezanpour
00:11:15 Quantizing Mechanical motion
00:14:26 Quantizing internal degrees of freedom
00:18:29 So which way we go in quantizing?
00:18:51 Waveguide quantum optics
00:20:41 Question by Dr. Maxim Gorlach
00:22:11 Question by Mr. Shahab Ramezanpour
00:23:58 WG quantum optics -- WG quantum optomechanics
00:27:16 Question by Dr. Mihail Petrov
00:28:06 Question by Dr. Alexander Poddubny
00:30:41 Step aside 1. Dimensions.
00:34:36 Step aside 2. Coupling strength
00:36:53 Question by Dr. Mihail Petrov
00:43:13 PT-symmetry
00:47:36 Question by Dr. Maxim Gorlach
00:49:36 Question by Dr. Mihail Petrov
00:50:26 Comment by Dr. Alexander Poddubny
00:51:11 Question by Mr. Shahab Ramezanpour
00:54:07 Single-photon scattering
00:57:34 Conclusion and outlook
00:58:36 Questions in the end
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