Design of Efficient Acoustic Interfaces for Quantum Emitters in Diamond

Abstract

Solid-state atomic defects--known as quantum emitters--in diamond are a valuable technology for quantum networking and computing due to their optically active transitions that interface on-chip systems with flying photons as well as their long-lived spin transitions that function as quantum memories. These advantages motivate the development of quantum emitter interfaces that can allow other technologies, such as superconducting circuits, nanomechanical resonators, and telecom optical cavities to interact with quantum emitters. Here, we propose two devices that allow these systems to efficiently interact via spin-phonon interactions with Group IV Silicon vacancy (SiV⁻) centers in diamond. First, we design and simulate a spin-optomechanical interface with ultrasmall mechanical and optical mode volumes ([formula] and [formula], respectively) to interface SiV⁻ centers with a telecom optical mode for quantum networking. Next, we design and simulate an electromechanical transducer that generates tripartite strong coupling from a superconducting circuit and SiV⁻ electron spin to an intermediary phonon mode (with ultra-high cooperativities (~10³ and ~10², respectively). Finally, we discuss the deployment of these two devices in quantum information protocols: heralded entanglement using our spin-optomechanical interface; and superconducting circuit-to-spin quantum transduction, information storage, and networking using our spin-electromechanical transducer.