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Bulletin of the American Physical Society

Development of highly nondegenerate polarization entanglement on a waveguide SPDC source

Kristina A. Meier, Fumihiro Kaneda, Paul G. Kwiat

Published May 30, 2019• 0 citations
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High Resolution Image Download MS PowerPoint Slide Photon-pair sources are useful for entanglement distribution. The most mature of these are spontaneous parametric downconversion (SPDC) sources, most of which achieve phasematching via engineering the domains in poled crystals or the angle between the optic axis and the pump beam. For multichannel entanglement distribution of photon pairs, where one photon is transmitted through free-space and the other photon is transmitted through fiber, it is beneficial to use highly nondegenerate photon-pair sources. The currently accepted approach in such sources is quasi-phasematching. In this paper, a simpler, more stable alternative is presented for producing highly nondegenerate photon pairs. A source of polarization-entangled photon pairs with low temperature sensitivity based on noncritical phasematched SPDC in single-domain potassium titanyl phosphate was demonstrated. Over a crystal temperature range of 75 °C, the center wavelength of the idler photons was observed to change by 10.8(20) nm while the average entanglement visibility was maintained above 98%. With the signal photons detected locally, the idler photons were transmitted through 62 km and 93 km of deployed telecom fibers with average raw visibilities of 98.2(1)% and 95.6(3)% respectively.

arXiv:2502.18752•ACS Photonics•Sep 17, 2025•2 citations
As optical quantum information processing protocols and experiments become increasingly more complex, integrated optics provide a small and robust alternative to traditional bulk optics. Specifically, waveguide technology allows for the creation of bright single-photon sources based on the fact that photon pairs can be created at any location along the waveguide. For our goals, we are working on the characterization of a highly nondegenerate Spontaneous Parametric Down-Conversion (SPDC) waveguide source on a periodically poled KTP (PPKTP) crystal. Our current waveguide source uses type-II phase-matching to create collinear signal and idler photons at 1550 nm and 810 nm, respectively, with the promise of generating simultaneous time-bin and polarization entanglement in future iterations. Our intended source application is for use in quantum key distribution and superdense teleportation protocols between a space platform and collection telescopes on Earth.
High Resolution Image Download MS PowerPoint Slide Photon-pair sources are useful for entanglement distribution. The most mature of these are spontaneous parametric downconversion (SPDC) sources, most of which achieve phasematching via engineering the domains in poled crystals or the angle between the optic axis and the pump beam. For multichannel entanglement distribution of photon pairs, where one photon is transmitted through free-space and the other photon is transmitted through fiber, it is beneficial to use highly nondegenerate photon-pair sources. The currently accepted approach in such sources is quasi-phasematching. In this paper, a simpler, more stable alternative is presented for producing highly nondegenerate photon pairs. A source of polarization-entangled photon pairs with low temperature sensitivity based on noncritical phasematched SPDC in single-domain potassium titanyl phosphate was demonstrated. Over a crystal temperature range of 75 °C, the center wavelength of the idler photons was observed to change by 10.8(20) nm while the average entanglement visibility was maintained above 98%. With the signal photons detected locally, the idler photons were transmitted through 62 km and 93 km of deployed telecom fibers with average raw visibilities of 98.2(1)% and 95.6(3)% respectively.