Quantum-correlated photon-pair generation via cascaded nonlinearity in an ultra-compact lithium-niobate nano-waveguide

Bradley S. Elkus*, Kamal Abdelsalam, Sasan Fathpour, Prem Kumar, Gregory S. Kanter

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

We generate quantum-correlated photon pairs using cascaded χ(2) : χ(2) traveling-wave interactions for second-harmonic generation (SHG) and spontaneous parametric downconversion (SPDC) in a single periodically-poled thin-film lithium-niobate (TFLN) waveguide. When pulse-pumped at 50 MHz, a 4-mm-long poled region with nearly 300%/Wcm2 SHG peak efficiency yields a generated photon-pair probability of 7±0.2 × 10−4 with corresponding coincidence-to-accidental ratio (CAR) of 13.6±0.7. The CAR is found to be limited by Stokes/anti-Stokes Raman-scattering noise generated primarily in the waveguide. A Raman peak of photon counts at 250 cm−1 Stokes shift from the fundamental-pump wavenumber suggests most of the noise that limits the CAR originates within the lithium niobate material of the waveguide.

Original languageEnglish (US)
Pages (from-to)39963-39975
Number of pages13
JournalOptics Express
Volume28
Issue number26
DOIs
StatePublished - Dec 21 2020

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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