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Photonic Quantum Computing

Entangled photon triplets using lithium niobate nanophotonics

arXiv
Authors: Nathan A. Harper, Ayantika Sengupta, Emily Y. Hwang, Scott K. Cushing

Year

2025

Paper ID

36088

Status

Preprint

Abstract Read

~2 min

Abstract Words

101

Citations

N/A

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.

Why This Paper Matters

  • This paper contributes to the Photonic Quantum Computing research area in the Quantum Articles archive.
  • It adds a 2025 reference point for readers tracking recent quantum research.
  • Multiphoton states are needed for quantum communication and computation.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2512.24053 [2] arXiv https://arxiv.org/abs/2512.24053 [3] Publisher https://arxiv.org/abs/2512.24053

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