Direct Polarization-Entangled Photon Pair Generation Using Domain-Engineered Nonlinear Crystals
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866908397583990784 |
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| author | Shukhin, Anatoly Hurvitz, Inbar Vidro, Leonid Arie, Ady Eisenberg, Hagai S. |
| author_facet | Shukhin, Anatoly Hurvitz, Inbar Vidro, Leonid Arie, Ady Eisenberg, Hagai S. |
| contents | A bi-photon polarization-frequency entanglement source was realized by shaping the phase-matching function of a poled KTP crystal. It provides a simple method to achieve either polarization or spectral entanglement in a simple collinear setup, based on single-pass SPDC and a dichroic (or polarizing) beam splitter. This is a robust and cost-effective configuration that can be easily implemented outside the laboratory environment. We characterized the source by two approaches: reconstructing the density matrix of the generated state with quantum state tomography, by recording the coincidences across 16 mutual polarization settings, in addition to a new method based on quantifying the symmetry of the joint spectral intensity by swapping between the signal and idler wavelengths. The polarization-entangled source violates the Clauser-Horne-Shimony-Holt inequality with a measured $S=2.747\pm 0.004$. We also measured the polarization entanglement visibility in two mutually unbiased polarization bases and evaluated the squeezing level by characterizing the reduction in visibility at high pump power. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_06460 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Direct Polarization-Entangled Photon Pair Generation Using Domain-Engineered Nonlinear Crystals Shukhin, Anatoly Hurvitz, Inbar Vidro, Leonid Arie, Ady Eisenberg, Hagai S. Quantum Physics A bi-photon polarization-frequency entanglement source was realized by shaping the phase-matching function of a poled KTP crystal. It provides a simple method to achieve either polarization or spectral entanglement in a simple collinear setup, based on single-pass SPDC and a dichroic (or polarizing) beam splitter. This is a robust and cost-effective configuration that can be easily implemented outside the laboratory environment. We characterized the source by two approaches: reconstructing the density matrix of the generated state with quantum state tomography, by recording the coincidences across 16 mutual polarization settings, in addition to a new method based on quantifying the symmetry of the joint spectral intensity by swapping between the signal and idler wavelengths. The polarization-entangled source violates the Clauser-Horne-Shimony-Holt inequality with a measured $S=2.747\pm 0.004$. We also measured the polarization entanglement visibility in two mutually unbiased polarization bases and evaluated the squeezing level by characterizing the reduction in visibility at high pump power. |
| title | Direct Polarization-Entangled Photon Pair Generation Using Domain-Engineered Nonlinear Crystals |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2506.06460 |