期刊
NATURE COMMUNICATIONS
卷 9, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-018-04339-w
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资金
- EPSRC Grant [EP/M003183/1]
- MURI Center for Dynamic Magneto-Optics via the AFOSR Award [FA9550-14-1-0040]
- Army Research Office (ARO) [73315PH]
- AOARD grant [FA2386-18-1-4045]
- IMPACT program of JST
- RIKEN-AIST Challenge Research Fund
- JSPS-RFBR grant [17-52-50023]
- Sir John Templeton Foundation
- CREST Grant [JPMJCR1676]
- JSPS Postdoctoral Fellowship for Research in Japan [PE17030]
Recent technological developments have made it increasingly easy to access the non-perturbative regimes of cavity quantum electrodynamics known as ultrastrong or deep strong coupling, where the light-matter coupling becomes comparable to the bare modal frequencies. In this work, we address the adequacy of the broadly used single-mode cavity approximation to describe such regimes. We demonstrate that, in the non-perturbative light-matter coupling regimes, the single-mode models become unphysical, allowing for superluminal signalling. Moreover, considering the specific example of the quantum Rabi model, we show that the multi-mode description of the electromagnetic field, necessary to account for light propagation at finite speed, yields physical observables that differ radically from their single-mode counterparts already for moderate values of the coupling. Our multi-mode analysis also reveals phenomena of fundamental interest on the dynamics of the intracavity electric field, where a free photonic wavefront and a bound state of virtual photons are shown to coexist.
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