High-Visibility Franson Interference Enabled by Passive Photonic Integrated Interferometers at Telecom Wavelengths
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866914426660061184 |
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| author | Emadi, Ramin Ribezzo, Domenico Guarda, Giulia Bacco, Davide Zavatta, Alessandro |
| author_facet | Emadi, Ramin Ribezzo, Domenico Guarda, Giulia Bacco, Davide Zavatta, Alessandro |
| contents | High-visibility Franson interference at telecom C-band wavelengths is achieved using a cascaded periodically poled lithium niobate (PPLN) waveguide photon-pair source combined with fully passive, path-imbalanced Mach-Zehnder interferometers implemented on photonic integrated circuits (PICs). The interferometers require neither on-chip phase shifters nor active stabilization; instead, the phase is scanned via thermal tuning of the chip. By employing a narrow-linewidth continuous-wave (CW) pump and dense wavelength-division multiplexing (DWDM) filtering, energy-time entangled photon pairs with high spectral indistinguishability are generated. We achieve a 4.8% heralding efficiency and a two-photon interference visibility of 97.1% from sinusoidal fringe fitting (raw visibility 95.2% and background-corrected visibility 95.6%), alongside a coincidence-to-accidental ratio (CAR) exceeding 1000 at only 1.7 mW of pump power. These results represent one of the highest Franson-interference visibilities reported for a PIC-based analyzer within a compact, fiber-integrated platform. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_26355 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | High-Visibility Franson Interference Enabled by Passive Photonic Integrated Interferometers at Telecom Wavelengths Emadi, Ramin Ribezzo, Domenico Guarda, Giulia Bacco, Davide Zavatta, Alessandro Quantum Physics High-visibility Franson interference at telecom C-band wavelengths is achieved using a cascaded periodically poled lithium niobate (PPLN) waveguide photon-pair source combined with fully passive, path-imbalanced Mach-Zehnder interferometers implemented on photonic integrated circuits (PICs). The interferometers require neither on-chip phase shifters nor active stabilization; instead, the phase is scanned via thermal tuning of the chip. By employing a narrow-linewidth continuous-wave (CW) pump and dense wavelength-division multiplexing (DWDM) filtering, energy-time entangled photon pairs with high spectral indistinguishability are generated. We achieve a 4.8% heralding efficiency and a two-photon interference visibility of 97.1% from sinusoidal fringe fitting (raw visibility 95.2% and background-corrected visibility 95.6%), alongside a coincidence-to-accidental ratio (CAR) exceeding 1000 at only 1.7 mW of pump power. These results represent one of the highest Franson-interference visibilities reported for a PIC-based analyzer within a compact, fiber-integrated platform. |
| title | High-Visibility Franson Interference Enabled by Passive Photonic Integrated Interferometers at Telecom Wavelengths |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2603.26355 |