Kavli Affiliate: Alireza Marandi
| First 5 Authors: Nathan Harper, Emily Hwang, Ryoto Sekine, Luis Ledezma, Christian Perez
| Summary:
Efficient on-chip entangled photon pair generation at telecom wavelengths is
an integral aspect of emerging quantum optical technologies, particularly for
quantum communication and computing. However, moving to shorter wavelengths
enables the use of more accessible silicon detector technology and opens up
applications in imaging and spectroscopy. Here, we present high brightness
($(1.6 pm 0.3) times 10^{9}$ pairs/mW/nm) visible-near-IR photon pair
generation in a periodically poled lithium niobate nanophotonic waveguide. The
degenerate spectrum of the photon pairs is centered at 811 nm with a bandwidth
of 117 nm. The measured on-chip source efficiency of $(2.3pm 0.5) times
10^{11}$ pairs/mW is on par with source efficiencies at telecom wavelengths and
is also orders of magnitude higher than the efficiencies of other visible
sources implemented in bulk crystal or diffused waveguide-based technologies.
These results represent the shortest wavelength of photon pairs generated in a
nanophotonic waveguide reported to date by nearly an octave.
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