Entangled photon triplets using lithium niobate nanophotonics

• URL: http://arxiv.org/abs/2512.24053v2
• Date: Wed, 07 Jan 2026 20:40:26 GMT
• Title: Entangled photon triplets using lithium niobate nanophotonics
• Authors: Nathan A. Harper, Ayantika Sengupta, Emily Y. Hwang, Scott K. Cushing,
• Abstract summary: Multiphoton states are more difficult to generate than one- and two-photon states because two individual down-conversion processes must be cascaded.<n>We integrate two down-converters on the same thin-film lithium niobate waveguide, significantly enhancing the cascaded process efficiency to $237 pm 36$ kHz/mW.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Multiphoton states are needed for quantum communication and computation. Multiphoton states are significantly more difficult to generate than one- and two-photon states because two individual down-conversion processes must be cascaded. Only efficiencies of $<100$ Hz/mW have been reported to date. We integrate two down-converters on the same thin-film lithium niobate waveguide, significantly enhancing the cascaded process efficiency to $237 \pm 36$ kHz/mW. The measured $4.4 \times 10^{-5}$ probability of the second down-converter, which sets the limit on detectable triplet rates, exceeds those of previous triplet sources by an order of magnitude and demonstrates a path towards MHz rates of triplets for quantum applications.

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