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Nonreciprocal generation of Bell states via cooperative dissipation in a qubit-magnon system
arXiv:2611.03011v1 Announce Type: new 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 ($+\mathbf{B}_0$) and negative ($-\mathbf{B}_0$) bias fields. Consequently, nonreciprocal Bell-state generation is achieved: $+\mathbf{B}_0$ yields one Bell state, while $-\mathbf{B}_0$ 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.
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 ($+\mathbf{B}_0$) and negative ($-\mathbf{B}_0$) bias fields. Consequently, nonreciprocal Bell-state generation is achieved: $+\mathbf{B}_0$ yields one Bell state, while $-\mathbf{B}_0$ 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.
arXiv:2611.03011 [quant-ph]
(or arXiv:2611.03011v1 [quant-ph] for this version)
https://doi.org/10.48550/arXiv.2611.03011 Focus to learn more arXiv-issued DOI via DataCite (pending registration)
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