Gigahertz-rate thin-film lithium niobate receiver for time-bin quantum communication
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| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866911719328055296 |
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| author | Bernardi, Andrea Clementi, Marco Bacchi, Marcello Bolaños, Matías Rubén Congia, Sara Garrisi, Francesco Martellosio, Andrea Passoni, Marco Wrobel, Alexander Agnesi, Costantino Vallone, Giuseppe Villoresi, Paolo Sabattoli, Federico Andrea Galli, Matteo Bajoni, Daniele |
| author_facet | Bernardi, Andrea Clementi, Marco Bacchi, Marcello Bolaños, Matías Rubén Congia, Sara Garrisi, Francesco Martellosio, Andrea Passoni, Marco Wrobel, Alexander Agnesi, Costantino Vallone, Giuseppe Villoresi, Paolo Sabattoli, Federico Andrea Galli, Matteo Bajoni, Daniele |
| contents | Time-bin encoded quantum states of light are crucial for quantum technology applications. The integration of manipulation functionalities into chip-scale devices is essential for deploying scalable, high-performance, and cost-effective quantum networks. Here we develop a fully integrated, high-throughput quantum receiver based on the thin-film lithium niobate (TFLN) platform, capable of high-speed electro-optic manipulation of time-bin encoded quantum states. The device's novel architecture enables active switching of time-bin quantum states with an electro-optic bandwidth exceeding 30 Ghz, while supporting real-time arbitrary projective measurements with a bandwidth of over 1 GHz. We showcase its versatility and performance through several applications, including the certification of entanglement with Bell's inequality violation by 38 standard deviations and with >95% visibility. We then apply it to a fiber-based quantum communication scenario, where we experimentally demonstrate an entanglement-based quantum key distribution (QKD) protocol, achieving stable finite-size secure key rates exceeding 25 kbit/s over 12 hours of continuous operation. By leveraging a high-speed active switching scheme, the system overcomes the need for temporal post-selection, eliminating a fundamental loophole that compromises the security of time-bin entanglement-based QKD protocols and relaxes the temporal resolution requirements of single-photon detectors. Moreover, it enables active selection of the projection basis, increasing the flexibility for communication parties. This approach establishes a versatile and scalable architecture for time-bin encoded quantum communication, enabling practical protocols on industry-grade photonic technology. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2604_16695 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Gigahertz-rate thin-film lithium niobate receiver for time-bin quantum communication Bernardi, Andrea Clementi, Marco Bacchi, Marcello Bolaños, Matías Rubén Congia, Sara Garrisi, Francesco Martellosio, Andrea Passoni, Marco Wrobel, Alexander Agnesi, Costantino Vallone, Giuseppe Villoresi, Paolo Sabattoli, Federico Andrea Galli, Matteo Bajoni, Daniele Quantum Physics Optics Time-bin encoded quantum states of light are crucial for quantum technology applications. The integration of manipulation functionalities into chip-scale devices is essential for deploying scalable, high-performance, and cost-effective quantum networks. Here we develop a fully integrated, high-throughput quantum receiver based on the thin-film lithium niobate (TFLN) platform, capable of high-speed electro-optic manipulation of time-bin encoded quantum states. The device's novel architecture enables active switching of time-bin quantum states with an electro-optic bandwidth exceeding 30 Ghz, while supporting real-time arbitrary projective measurements with a bandwidth of over 1 GHz. We showcase its versatility and performance through several applications, including the certification of entanglement with Bell's inequality violation by 38 standard deviations and with >95% visibility. We then apply it to a fiber-based quantum communication scenario, where we experimentally demonstrate an entanglement-based quantum key distribution (QKD) protocol, achieving stable finite-size secure key rates exceeding 25 kbit/s over 12 hours of continuous operation. By leveraging a high-speed active switching scheme, the system overcomes the need for temporal post-selection, eliminating a fundamental loophole that compromises the security of time-bin entanglement-based QKD protocols and relaxes the temporal resolution requirements of single-photon detectors. Moreover, it enables active selection of the projection basis, increasing the flexibility for communication parties. This approach establishes a versatile and scalable architecture for time-bin encoded quantum communication, enabling practical protocols on industry-grade photonic technology. |
| title | Gigahertz-rate thin-film lithium niobate receiver for time-bin quantum communication |
| topic | Quantum Physics Optics |
| url | https://arxiv.org/abs/2604.16695 |