Nonreciprocal generation of Bell states via cooperative dissipation in a qubit-magnon system
Abstract
Directionally generating and controlling quantum states is critical in chiral quantum technologies. Here, we propose a scheme for the nonreciprocal generation of Bell states via cooperative dissipation in a qubit-magnon system, consisting of a superconducting transmon qubit and a yttrium iron garnet sphere subject to a bias magnetic field. The cooperative dissipation between them is induced by coupling both to a common transmission-line waveguide. Due to this cooperative dissipation, the system possesses a dark eigenstate within the single-excitation subspace. Under appropriate parameter conditions, the dark eigenstate reduces to a specific Bell state. With the assistance of a drive pulse, the system can be prepared in this Bell state (i.e., the dark eigenstate). In particular, we find that the dark eigenstate corresponds to different Bell states under positive (+B0) and negative (−B0) bias fields. Consequently, nonreciprocal Bell-state generation is achieved: +B0 yields one Bell state, while −B0 yields the other. Moreover, we define a fidelity-based nonreciprocal rate to quantify this nonreciprocity. Our work establishes cooperative dissipation as a versatile resource for nonreciprocal entangled-state generation, opening a promising route toward chiral quantum technologies.
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BibTeX
@misc{gao2026nonreciprocal,
title = {{Nonreciprocal generation of Bell states via cooperative dissipation in a qubit-magnon system}},
author = {Fei Gao and Xiang-Jing Geng and Wei Feng and Lijiong Shen and Guo-Qiang Zhang},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.03011},
eprint = {2611.03011},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.03011},
}
RIS
TY - UNPB
TI - Nonreciprocal generation of Bell states via cooperative dissipation in a qubit-magnon system
AU - Fei Gao
AU - Xiang-Jing Geng
AU - Wei Feng
AU - Lijiong Shen
AU - Guo-Qiang Zhang
PY - 2026
DA - 2026/11/02
PB - arXiv
DO - 10.48550/arxiv.2611.03011
UR - https://arxiv.org/abs/2611.03011
AB - Directionally generating and controlling quantum states is critical in chiral quantum technologies. Here, we propose a scheme for the nonreciprocal generation of Bell states via cooperative dissipation in a qubit-magnon system, consisting of a superconducting transmon qubit and a yttrium iron garnet sphere subject to a bias magnetic field. The cooperative dissipation between them is induced by coupling both to a common transmission-line waveguide. Due to this cooperative dissipation, the system possesses a dark eigenstate within the single-excitation subspace. Under appropriate parameter conditions, the dark eigenstate reduces to a specific Bell state. With the assistance of a drive pulse, the system can be prepared in this Bell state (i.e., the dark eigenstate). In particular, we find that the dark eigenstate corresponds to different Bell states under positive (+B_0) and negative (−B_0) bias fields. Consequently, nonreciprocal Bell-state generation is achieved: +B_0 yields one Bell state, while −B_0 yields the other. Moreover, we define a fidelity-based nonreciprocal rate to quantify this nonreciprocity. Our work establishes cooperative dissipation as a versatile resource for nonreciprocal entangled-state generation, opening a promising route toward chiral quantum technologies.
ER -