Abstract
We propose a scheme to achieve nonreciprocal magnon blockade via the Barnett effect in a magnon-based hybrid system. Due to the rotating yttrium iron garnet (YIG) sphere, the Barnett shift induced by the Barnett effect can be tuned from positive to negative via controlling magnetic field direction, leading to nonreciprocity. We show that a nonreciprocal unconventional magnon blockade (UMB) can emerge only from one magnetic field direction but not from the other side. Particularly, by further tuning system parameters, we simultaneously observe a nonreciprocal conventional magnon blockade (CMB) and a nonreciprocal UMB. This result achieves a switch between efficiency (UMB) and purity (CMB) of a single-magnon blockade. Interestingly, stronger UMB can be reached under stronger qubit-magnon coupling, even the strong coupling regime. Moreover, the nonreciprocity of the magnon blockade is sensitive to temperature. This work opens up a way for achieving quantum nonreciprocal magnetic devices and chiral magnon communications.
© 2024 Optica Publishing Group
Full Article | PDF ArticleMore Like This
Han-Qiu Zhang, Shuang-Shuo Chu, Jian-Song Zhang, Wen-Xue Zhong, and Guang-Ling Cheng
Opt. Lett. 49(8) 2009-2012 (2024)
Zhong Ding, Yong-Pan Gao, and Yong Zhang
J. Opt. Soc. Am. B 41(2) 332-340 (2024)
Pooja Kumari Gupta, Sampreet Kalita, and Amarendra K. Sarma
J. Opt. Soc. Am. B 41(2) 447-455 (2024)