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arXiv · 2108.11156

Quantum network with magnonic and mechanical nodes

Jie Li·Yi-Pu Wang·Wei-Jiang Wu·Shi-Yao Zhu·J. Q. You
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Abstract

A quantum network consisting of magnonic and mechanical nodes connected by light is proposed. Recent years have witnessed a significant development in cavity magnonics based on collective spin excitations in ferrimagnetic crystals, such as yttrium iron garnet (YIG). Magnonic systems are considered to be a promising building block for a future quantum network. However, a major limitation of the system is that the coherence time of the magnon excitations is limited by their intrinsic loss (typically in the order of 1 $μ$s for YIG). Here, we show that by coupling the magnonic system to a mechanical system using optical pulses, an arbitrary magnonic state (either classical or quantum) can be transferred to and stored in a distant long-lived mechanical resonator. The fidelity depends on the pulse parameters and the transmission loss. We further show that the magnonic and mechanical nodes can be prepared in a macroscopic entangled state. These demonstrate the quantum state transfer and entanglement distribution in such a novel quantum network of magnonic and mechanical nodes. Our work shows the possibility to connect two separate fields of optomagnonics and optomechanics, and to build a long-distance quantum network based on magnonic and mechanical systems.

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Jie Li, Yi-Pu Wang, Wei-Jiang Wu, Shi-Yao Zhu, J. Q. You. 2021-12-01. Quantum network with magnonic and mechanical nodes. https://arxiv.org/abs/2108.11156

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