English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The interaction between the electromagnetic field inside a cavity and naturalor artificial atoms has played a crucial role in developing our understandingof light-matter interaction, and is central to various quantum technologies.Recently, new regimes beyond the weak and strong light-matter coupling havebeen explored in several settings. These regimes, where the interactionstrength is comparable (ultrastrong) or even higher (deep-strong) than thetransition frequencies in the system, can give rise to new physical effects andapplications. At the same time, they challenge our understanding of cavity QED.When the interaction strength is so high, fundamental issues like the properdefinition of subsystems and of their quantum measurements, the structure oflight-matter ground states, or the analysis of time-dependent interactions aresubject to ambiguities leading to even qualitatively distinct predictions. Theresolution of these ambiguities is also important for understanding anddesigning next-generation quantum devices that will exploit the ultrastrongcoupling regime. Here we discuss and provide solutions to these issues.

Gauge freedom, quantum measurements, and time-dependent interactions in cavity and circuit QED