TY - JOUR
T1 - Experimental realization of on-chip few-photon control around exceptional points
AU - Song, Pengtao
AU - Ruan, Xinhui
AU - Ding, Haijin
AU - Li, Shengyong
AU - Chen, Ming
AU - Huang, Ran
AU - Kuang, Le Man
AU - Zhao, Qianchuan
AU - Tsai, Jaw Shen
AU - Jing, Hui
AU - Yang, Lan
AU - Nori, Franco
AU - Zheng, Dongning
AU - Liu, Yu Xi
AU - Zhang, Jing
AU - Peng, Zhihui
N1 - Publisher Copyright:
© The Author(s) 2024.
PY - 2024/12
Y1 - 2024/12
N2 - Non-Hermitian physical systems have attracted considerable attention in recent years for their unique properties around exceptional points (EPs), where the eigenvalues and eigenstates of the system coalesce. Phase transitions near exceptional points can lead to various interesting phenomena, such as unidirectional wave transmission. However, most of those studies are in the classical regime and whether these properties can be maintained in the quantum regime is still a subject of ongoing studies. Using a non-Hermitian on-chip superconducting quantum circuit, here we observe a phase transition and the corresponding exceptional point between the two phases. Furthermore, we demonstrate that unidirectional microwave transmission can be achieved even in the few-photon regime within the broken symmetry phase. This result holds some potential applications, such as on-chip few-photon microwave isolators. Our study reveals the possibility of exploring the fundamental physics and practical quantum devices with non-Hermitian systems based on superconducting quantum circuits.
AB - Non-Hermitian physical systems have attracted considerable attention in recent years for their unique properties around exceptional points (EPs), where the eigenvalues and eigenstates of the system coalesce. Phase transitions near exceptional points can lead to various interesting phenomena, such as unidirectional wave transmission. However, most of those studies are in the classical regime and whether these properties can be maintained in the quantum regime is still a subject of ongoing studies. Using a non-Hermitian on-chip superconducting quantum circuit, here we observe a phase transition and the corresponding exceptional point between the two phases. Furthermore, we demonstrate that unidirectional microwave transmission can be achieved even in the few-photon regime within the broken symmetry phase. This result holds some potential applications, such as on-chip few-photon microwave isolators. Our study reveals the possibility of exploring the fundamental physics and practical quantum devices with non-Hermitian systems based on superconducting quantum circuits.
UR - http://www.scopus.com/inward/record.url?scp=85209201509&partnerID=8YFLogxK
U2 - 10.1038/s41467-024-54199-w
DO - 10.1038/s41467-024-54199-w
M3 - Article
C2 - 39537631
AN - SCOPUS:85209201509
SN - 2041-1723
VL - 15
JO - Nature communications
JF - Nature communications
IS - 1
M1 - 9848
ER -