Counter-propagating Entangled Photon Pairs from a Monolayer
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arXiv
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866916890058686464 |
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| author | Lu, Zhuoyuan Janousek, Jiri Assad, Syed M. Qiu, Shuyao Joshi, Mayank Hu, Yecheng Song, Alex Y Wang, Chuanyu Suriyage, Manuka Zhao, Jie Lam, Ping Koy Lu, Yuerui |
| author_facet | Lu, Zhuoyuan Janousek, Jiri Assad, Syed M. Qiu, Shuyao Joshi, Mayank Hu, Yecheng Song, Alex Y Wang, Chuanyu Suriyage, Manuka Zhao, Jie Lam, Ping Koy Lu, Yuerui |
| contents | Non-phase-matched spontaneous parametric down-conversion (SPDC) in atomically thin materials provides new degrees of freedom and enhanced quantum information capacity compared to conventional phase-matched sources. These systems emerged as promising platforms for quantum computing, communication, and imaging, with the potential to support higher-order nonlinear processes. However, direct observation of photon-pair emission from a monolayer has remained experimentally challenging. In this work, we theoretically modeled SPDC emission across the full angular space from a monolayer GaSe film and experimentally validated the model through measurements of both co- and counter-propagating photon pairs. We demonstrated two-photon quantum correlations in the telecom C-band from the thinnest SPDC source reported to date. The spatially symmetric, broadband emission predicted by theory was confirmed experimentally. Furthermore, we observed high-fidelity Bell states in the counter-propagating configuration, marking the first realization of polarization-entangled photon pairs from a monolayer. Our results revealed the emission characteristics of SPDC in the deeply subwavelength, non-phase-matched regime, and introduced atomically thin, counterpropagating SPDC as a scalable and integrable platform for programmable quantum state generation, extendable via moiré superlattice engineering. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_06860 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Counter-propagating Entangled Photon Pairs from a Monolayer Lu, Zhuoyuan Janousek, Jiri Assad, Syed M. Qiu, Shuyao Joshi, Mayank Hu, Yecheng Song, Alex Y Wang, Chuanyu Suriyage, Manuka Zhao, Jie Lam, Ping Koy Lu, Yuerui Quantum Physics Optics Non-phase-matched spontaneous parametric down-conversion (SPDC) in atomically thin materials provides new degrees of freedom and enhanced quantum information capacity compared to conventional phase-matched sources. These systems emerged as promising platforms for quantum computing, communication, and imaging, with the potential to support higher-order nonlinear processes. However, direct observation of photon-pair emission from a monolayer has remained experimentally challenging. In this work, we theoretically modeled SPDC emission across the full angular space from a monolayer GaSe film and experimentally validated the model through measurements of both co- and counter-propagating photon pairs. We demonstrated two-photon quantum correlations in the telecom C-band from the thinnest SPDC source reported to date. The spatially symmetric, broadband emission predicted by theory was confirmed experimentally. Furthermore, we observed high-fidelity Bell states in the counter-propagating configuration, marking the first realization of polarization-entangled photon pairs from a monolayer. Our results revealed the emission characteristics of SPDC in the deeply subwavelength, non-phase-matched regime, and introduced atomically thin, counterpropagating SPDC as a scalable and integrable platform for programmable quantum state generation, extendable via moiré superlattice engineering. |
| title | Counter-propagating Entangled Photon Pairs from a Monolayer |
| topic | Quantum Physics Optics |
| url | https://arxiv.org/abs/2508.06860 |