Self-Aligned Heterogeneous Quantum Photonic Integration

• URL: http://arxiv.org/abs/2601.14552v1
• Date: Wed, 21 Jan 2026 00:24:44 GMT
• Title: Self-Aligned Heterogeneous Quantum Photonic Integration
• Authors: Kinfung Ngan, Yeeun Choi, Chun-Chieh Chang, Dongyeon Daniel Kang, Shuo Sun,
• Abstract summary: Integrated quantum photonics holds significant promise for scalable photonic quantum information processing, quantum repeaters, and quantum networks.<n>Here, we present a self-aligned heterogeneous quantum photonic integration approach that can deterministically achieve near-unity coupling efficiency at the interface.
• Score: 9.266158456096049
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Integrated quantum photonics holds significant promise for scalable photonic quantum information processing, quantum repeaters, and quantum networks, but its development is hindered by the mismatch between materials hosting high-quality quantum emitters and those compatible with mature photonic technologies. Heterogeneous integration offers a potential solution to this challenge, yet practical implementations have been limited by inevitable insertion losses at material interfaces. Here, we present a self-aligned heterogeneous quantum photonic integration approach that can deterministically achieve near-unity coupling efficiency at the interface. To showcase our approach, we demonstrate Purcell enhancement of a silicon vacancy (SiV) center in diamond induced by a heterogeneous photonic crystal cavity defined by titanium dioxide (TiO2), as well as optical spin control and readout via a TiO2 photonic circuit. We further show that, when combined with inverse photonic design, our approach enables efficient and broadband collection of single photons from a color center into a heterogeneous waveguide. Our approach is not restricted to SiV centers or TiO2; it can be broadly applied to integrate diverse solid-state quantum emitters with thin-film photonic devices where conformal deposition is possible. Together, these results establish a practical route to scalable quantum photonic integrated circuits that combine high-quality quantum emitters with technologically mature photonic platforms.

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