High-Q Cavity Interface for Color Centers in Thin Film Diamond
arxiv(2024)
摘要
Quantum information technology offers the potential to realize unprecedented
computational resources via secure channels capable of distributing
entanglement between quantum computers. Diamond, as a host to atom-like defects
with optically-accessible spin qubits, is a leading platform to realize quantum
memory nodes needed to extend the reach of quantum links. Photonic crystal
(PhC) cavities enhance light-matter interaction and are essential ingredients
of an efficient interface between spins and photons that are used to store and
communicate quantum information respectively. Despite great effort, however,
the realization of visible PhC cavities with high quality factor (Q) and design
flexibility is challenging in diamond. Here, we demonstrate one- and
two-dimensional PhC cavities fabricated in recently developed thin-film
diamonds, featuring Q-factors of 1.8x10^5 and 1.6x10^5, respectively, the
highest Qs for visible PhC cavities realized in any material. Importantly, our
fabrication process is simple and high-yield, based on conventional planar
fabrication techniques, in contrast to previous approaches that rely on complex
undercut methods. We also demonstrate fiber-coupled 1D PhC cavities with high
photon extraction efficiency, and optical coupling between a single SiV center
and such a cavity at 4K achieving a Purcell factor of 13. The demonstrated
diamond thin-film photonic platform will improve the performance and
scalability of quantum nodes and expand the range of quantum technologies.
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