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 $\mu$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.
Highlights
Hybrid quantum systems, composed of distinct physical systems with complementary functionalities, provide diverse novel platforms and promising opportunities for applications in quantum technologies, quantuminformation processing, and quantum sensing [1,2,3]
It merits our particular attention that, during the past decade a rapid and significant progress has been made in the field of cavity magnonics, based on coherently coupled microwave cavity photons and collective spin excitations in the ferrimagnetic material of yttrium iron garnet (YIG) [4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35]
We show the potential to build a quantum network [40,41] based on magnonic systems in view of their aforementioned excellent properties
Summary
Hybrid quantum systems, composed of distinct physical systems with complementary functionalities, provide diverse novel platforms and promising opportunities for applications in quantum technologies, quantuminformation processing, and quantum sensing [1,2,3]. A future quantum network could be constructed based on single atoms in optical cavities [42], or atomic ensembles following the Duan-Lukin-Cirac-Zoller protocol [43], or trapped atomic ions [44], etc Compared to these platforms as quantum nodes, where the atomic energy levels are fixed, a major advantage of magnonic systems lies in the fact that their resonance frequencies can be continuously adjusted by altering the external magnetic field. We show that an arbitrary magnonic state, either quantum or classical, can be transferred to a distant mechanical resonator by using optical pulses to successively activate the optomagnonic and optomechanical anti-Stokes processes.
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