Large-scale quantum-dot-lithium-niobate hybrid integrated photonic circuits enabling on-chip quantum networking

• URL: http://arxiv.org/abs/2503.23755v1
• Date: Mon, 31 Mar 2025 06:10:44 GMT
• Title: Large-scale quantum-dot-lithium-niobate hybrid integrated photonic circuits enabling on-chip quantum networking
• Authors: Xudong Wang, Xiuqi Zhang, Bowen Chen, Yifan Zhu, Yuanhao Qin, Lvbin Dong, Jiachen Cai, Dongchen Sui, Jinbo Wu, Quan Zhang,
• Abstract summary: Hybrid integrated quantum photonics combines solid-state artificial atoms with reconfigurable photonic circuits.<n>We present a hybrid photonic architecture that integrates QD-containing waveguides with low-loss lithium niobate (LN) circuits.<n>We achieve on-chip local spectral tuning of QD emissions by up to 7.7 meV, three orders of magnitude greater than the transform-limited linewidth.
• Score: 16.874573820653683
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Hybrid integrated quantum photonics combines solid-state artificial atoms with reconfigurable photonic circuits, enabling scalable chip-based quantum networks. Self-assembled quantum dots (QDs) are ideal for this goal due to their ability to generate highly indistinguishable single photons with exceptional brightness. Integrating QDs into low-loss photonic circuits can facilitate complex quantum networks by enabling entanglement transfer via two-photon interference. However, challenges such as limited scalability, spectral inhomogeneity, and quantum interference between independent sources remain. We present a hybrid photonic architecture that integrates QD-containing waveguides with low-loss lithium niobate (LN) circuits, incorporating 20 deterministic single-photon sources (SPSs). Using the piezoelectric properties of thin-film lithium niobate (TFLN), we achieve on-chip local spectral tuning of QD emissions by up to 7.7 meV,three orders of magnitude greater than the transform-limited linewidth. This approach enables on-chip quantum interference with a visibility of 0.73 between two spatially separated QD SPSs connected by 0.48 mm long waveguides, establishing a functional quantum network.The large-scale integration of spectrally tunable QD-based SPSs into low-loss LN circuits, combined with fast electro-optical switching, paves the way for compact, lightweight, and scalable photonic quantum networks.

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