Momentum-resolved two photon interference of weak coherent states
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908706794373120 |
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| author | Sgobba, Fabrizio Di Lena, Francesco Triggiani, Danilo Pallotti, Deborah Katia Lupo, Cosmo Daniele, Piergiorgio Fratta, Gennaro Acconcia, Giulia Rech, Ivan Amato, Luigi Santamaria |
| author_facet | Sgobba, Fabrizio Di Lena, Francesco Triggiani, Danilo Pallotti, Deborah Katia Lupo, Cosmo Daniele, Piergiorgio Fratta, Gennaro Acconcia, Giulia Rech, Ivan Amato, Luigi Santamaria |
| contents | We demonstrate an experimental scheme for high-precision position measurements based on transverse-momentum-resolved two-photon interferometry with independent photons and single photon avalanche diode (SPAD) arrays. Our scheme extends the operative range of Hong-Ou-Mandel interferometry beyond its intrinsic constraints due to photons indistinguishability, paving the way to applications in high-resolution imaging. We assess the experimental results against the ultimate precision bounds as determined by quantum estimation theory. Our experiment ultimately proves that transverse-momentum resolved measurements of fourth-order correlations in the fields can be employed to overcome spatial distinguishability between independent photons. The relevance of our results extends beyond sensing and imaging towards quantum information processing, as we show that partial photon distinguishability and entanglement impurity are not necessarily a nuisance in a technique that relies on two-photon interference. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_19978 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Momentum-resolved two photon interference of weak coherent states Sgobba, Fabrizio Di Lena, Francesco Triggiani, Danilo Pallotti, Deborah Katia Lupo, Cosmo Daniele, Piergiorgio Fratta, Gennaro Acconcia, Giulia Rech, Ivan Amato, Luigi Santamaria Quantum Physics Optics We demonstrate an experimental scheme for high-precision position measurements based on transverse-momentum-resolved two-photon interferometry with independent photons and single photon avalanche diode (SPAD) arrays. Our scheme extends the operative range of Hong-Ou-Mandel interferometry beyond its intrinsic constraints due to photons indistinguishability, paving the way to applications in high-resolution imaging. We assess the experimental results against the ultimate precision bounds as determined by quantum estimation theory. Our experiment ultimately proves that transverse-momentum resolved measurements of fourth-order correlations in the fields can be employed to overcome spatial distinguishability between independent photons. The relevance of our results extends beyond sensing and imaging towards quantum information processing, as we show that partial photon distinguishability and entanglement impurity are not necessarily a nuisance in a technique that relies on two-photon interference. |
| title | Momentum-resolved two photon interference of weak coherent states |
| topic | Quantum Physics Optics |
| url | https://arxiv.org/abs/2508.19978 |