High fidelity CNOT gates in photonic integrated circuits using composite segmented directional couplers
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arXiv
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| Autores principales: | , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866912745354428416 |
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| author | Piasetzky, Jonatan Rotem, Amit Warshavsky, Yuval Drori, Yehonatan Cohen, Khen Oz, Yaron Suchowski, Haim |
| author_facet | Piasetzky, Jonatan Rotem, Amit Warshavsky, Yuval Drori, Yehonatan Cohen, Khen Oz, Yaron Suchowski, Haim |
| contents | Integrated photonic circuits are a promising platform for scalable quantum information processing, but their performance is often constrained by component sensitivity to fabrication imperfections. Directional couplers, which are crucial building blocks for integrated quantum logic gates, are particularly prone to such limitations, with strong dependence on geometric and spectral parameters which reduces gate fidelity. Here, we demonstrate that composite segmented directional couplers (CSDC) offer a fabrication-tolerant alternative that enhances gate fidelity without active tuning. We design and fabricate a fully integrated photonic controlled-NOT (CNOT) gate using both uniform and composite coupler variants and compare their performance via simulation, classical characterization, and quantum two-photon interference. The composite design reduces the average error probability by nearly a factor of two and decreases variability fivefold. The residual error is primarily limited by photon indistinguishability. Classical matrix reconstruction confirms improved agreement with the ideal CNOT operation. These results establish CSDCs as compact, passive, and foundry-compatible building blocks for robust scalable quantum photonic circuits. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_25505 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | High fidelity CNOT gates in photonic integrated circuits using composite segmented directional couplers Piasetzky, Jonatan Rotem, Amit Warshavsky, Yuval Drori, Yehonatan Cohen, Khen Oz, Yaron Suchowski, Haim Optics Quantum Physics Integrated photonic circuits are a promising platform for scalable quantum information processing, but their performance is often constrained by component sensitivity to fabrication imperfections. Directional couplers, which are crucial building blocks for integrated quantum logic gates, are particularly prone to such limitations, with strong dependence on geometric and spectral parameters which reduces gate fidelity. Here, we demonstrate that composite segmented directional couplers (CSDC) offer a fabrication-tolerant alternative that enhances gate fidelity without active tuning. We design and fabricate a fully integrated photonic controlled-NOT (CNOT) gate using both uniform and composite coupler variants and compare their performance via simulation, classical characterization, and quantum two-photon interference. The composite design reduces the average error probability by nearly a factor of two and decreases variability fivefold. The residual error is primarily limited by photon indistinguishability. Classical matrix reconstruction confirms improved agreement with the ideal CNOT operation. These results establish CSDCs as compact, passive, and foundry-compatible building blocks for robust scalable quantum photonic circuits. |
| title | High fidelity CNOT gates in photonic integrated circuits using composite segmented directional couplers |
| topic | Optics Quantum Physics |
| url | https://arxiv.org/abs/2509.25505 |