This presentation focus on quantum transduction using rare-earth ions in solid state systems. We propose using magnetic materials with rare-earth dopants, harnessing the strong coupling between rare-earth spin transitions and magnons. We analyze this situation using a formalism similar to Ref. [PRL 113, 203601 (2014)]. We find that hosting rare-earth elements within a magnet dramatically speeds up the transduction rate by more than two orders of magnitude, which gives several key benefits: potentially higher efficiency as it is less affected by device internal losses, higher fidelity operations with the superconducting qubits, and reduced device constraints. Finally, we discuss several routes for implementing this type of quantum transducer.
Our study provides a step forward to the practical implementation of a quantum transducer, used for converting quantum information between two different physical realizations, one is good for information transmission while the other is good for manipulation and control. We propose using commercial materials with rare-earth elements, conveniently chosen to have useful optical properties for telecommunications. We find that hosting rare-earth elements within a magnet dramatically speeds up the transduction process.
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