Near-infrared hybrid quantum photonic interface for ¹⁷¹Yb³⁺ solid-state qubits

Abstract

¹⁷¹Yb³⁺ in YVO₄ is a promising candidate for building quantum networks with good optical addressability, excellent spin properties and a secondary nuclear-spin quantum register. However, the associated long optical lifetime necessitates coupling to optical resonators for faster emission of single photons and to facilitate control of single ¹⁷¹Yb ions. Previously, single ¹⁷¹⁢Yb ions were addressed by coupling them to monolithic photonic crystal cavities fabricated via lengthy focused ion beam milling. Here, we design and fabricate a hybrid platform based on ions coupled to the evanescently decaying field of a GaAs photonic crystal cavity. For the most strongly coupled ion close to the GaAs-YVO interface, we find a 64-fold reduction in lifetime corresponding to a Purcell enhancement of 179. For an ion with a Purcell enhancement of 21, we experimentally detect and demonstrate coherent optical control. The results show a promising route toward a quantum network with ¹⁷¹⁢Yb-YVO₄ using a highly scalable platform that can readily be applied to other quantum emitters in the near-infrared.

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