The THEORIE team has recently published a significant theoretical study in Nature Communications on the topic of quantum critical phenomena.
This research addresses a current debate that questions the traditional understanding of dissipative quantum phase transitions in Josephson junctions connected to resistive environments with impedances Z around the resistance quantum. Our study revisits this issue by examining a junction linked to a multimode transmission line. Using exact diagonalization, we demonstrate the emergence of the transition as the system size increases. Additionally, our findings provide illuminating insights into the universal spectrum at the critical point..
Reference:
Emergent quantum phase transition of a Josephson junction coupled to a high-impedance multimode resonator
Luca Giacomelli & Cristiano Ciuti
Nature Communications 15, 5455 (2024)
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