Inline Quantum Measurements with SNSPDs Coupled to Photonic Bound States
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arXiv
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| Auteurs principaux: | , , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866911310583693312 |
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| author | Martinelli, Filippo Vetlugin, Anton N. Dong, Shuyu Koh, Darren M. Z. Sidorova, Mariia Kurtsiefer, Christian Soci, Cesare |
| author_facet | Martinelli, Filippo Vetlugin, Anton N. Dong, Shuyu Koh, Darren M. Z. Sidorova, Mariia Kurtsiefer, Christian Soci, Cesare |
| contents | We report the realization of inline quantum measurements with waveguide-integrated superconducting nanowire single-photon detectors (SNSPDs). To suppress parasitic scattering at detector terminations, while ensuring compatibility with standard photonic substrates and cryogenic operation, we developed a photonic bound states in the continuum (BIC) platform based on etchless polymer waveguides. We show BIC-coupled inline detectors with on-chip efficiency exceeding 80%, recovery time of less than 2 ns, and intrinsic jitter of less than 70 ps. As a proof of principle, we implement Hanbury Brown and Twiss interferometry and photon number resolution with two collinear detectors within a footprint of $60 \cdot 6$ $μm^2$. The concept of inline quantum measurements could be further developed to support more complex circuit functionalities, such as higher-order correlation measurements, quantum state tomography, and multi-photon subtraction, within a compact architecture. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_07029 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Inline Quantum Measurements with SNSPDs Coupled to Photonic Bound States Martinelli, Filippo Vetlugin, Anton N. Dong, Shuyu Koh, Darren M. Z. Sidorova, Mariia Kurtsiefer, Christian Soci, Cesare Quantum Physics We report the realization of inline quantum measurements with waveguide-integrated superconducting nanowire single-photon detectors (SNSPDs). To suppress parasitic scattering at detector terminations, while ensuring compatibility with standard photonic substrates and cryogenic operation, we developed a photonic bound states in the continuum (BIC) platform based on etchless polymer waveguides. We show BIC-coupled inline detectors with on-chip efficiency exceeding 80%, recovery time of less than 2 ns, and intrinsic jitter of less than 70 ps. As a proof of principle, we implement Hanbury Brown and Twiss interferometry and photon number resolution with two collinear detectors within a footprint of $60 \cdot 6$ $μm^2$. The concept of inline quantum measurements could be further developed to support more complex circuit functionalities, such as higher-order correlation measurements, quantum state tomography, and multi-photon subtraction, within a compact architecture. |
| title | Inline Quantum Measurements with SNSPDs Coupled to Photonic Bound States |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2506.07029 |