Optimised spectral purity of unfiltered photons via pump and nonlinearity shaping
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866914533038096384 |
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| author | Faleo, Tommaso Morrison, Christopher L. Beignon, Roméo Graffitti, Francesco Remesh, Vikas Frick, Stefan Fedrizzi, Alessandro Weihs, Gregor Keil, Robert |
| author_facet | Faleo, Tommaso Morrison, Christopher L. Beignon, Roméo Graffitti, Francesco Remesh, Vikas Frick, Stefan Fedrizzi, Alessandro Weihs, Gregor Keil, Robert |
| contents | Photonic quantum technologies rely on the efficient generation and interference of indistinguishable photons. Exceptional achievements in this respect have been obtained by domain engineering of quasi-phase-matched parametric down-conversion sources, demonstrating high two-photon interference visibility using only moderate bandpass spectral filtering. Here, we optimised the spectral purity and indistinguishability of photons from telecom-wavelength sources by combining Gaussian quasi-phase-matching with Gaussian pump spectral shaping. Without spectral filtering, we used time-of-flight spectrometry to estimate an upper bound spectral purity of 99.9272(6)%, and achieved visibilities of up to 98.5(8)% in two-photon interference experiments with independent sources. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_06196 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Optimised spectral purity of unfiltered photons via pump and nonlinearity shaping Faleo, Tommaso Morrison, Christopher L. Beignon, Roméo Graffitti, Francesco Remesh, Vikas Frick, Stefan Fedrizzi, Alessandro Weihs, Gregor Keil, Robert Quantum Physics Applied Physics Optics Photonic quantum technologies rely on the efficient generation and interference of indistinguishable photons. Exceptional achievements in this respect have been obtained by domain engineering of quasi-phase-matched parametric down-conversion sources, demonstrating high two-photon interference visibility using only moderate bandpass spectral filtering. Here, we optimised the spectral purity and indistinguishability of photons from telecom-wavelength sources by combining Gaussian quasi-phase-matching with Gaussian pump spectral shaping. Without spectral filtering, we used time-of-flight spectrometry to estimate an upper bound spectral purity of 99.9272(6)%, and achieved visibilities of up to 98.5(8)% in two-photon interference experiments with independent sources. |
| title | Optimised spectral purity of unfiltered photons via pump and nonlinearity shaping |
| topic | Quantum Physics Applied Physics Optics |
| url | https://arxiv.org/abs/2510.06196 |