Affiliation:
1. Harvard University
2. Stanford University
3. Massachusetts Institute of Technology
4. California Institute of Technology
Abstract
Existing nonlinear-optic implementations of pure, unfiltered heralded single-photon sources do not offer the scalability required for densely integrated quantum networks. Additionally, lithium niobate has hitherto been unsuitable for such use due to its material dispersion. We engineer the dispersion and the quasi-phasematching conditions of a waveguide in the rapidly emerging thin-film lithium niobate platform to generate spectrally separable photon pairs in the telecommunications band. Such photon pairs can be used as spectrally pure heralded single-photon sources in quantum networks. We estimate a heralded-state spectral purity of >94% based on joint spectral intensity measurements. Further, a joint spectral phase-sensitive measurement of the unheralded time-integrated second-order correlation function yields a heralded-state purity of
(
86
±
5
)
%
.
Funder
National Science Foundation
U.S. Department of Energy
Army Research Office
National Center for Research Resources
Nippon Telegraph and Telephone
Harvard Quantum Initiative
Subject
Atomic and Molecular Physics, and Optics
Cited by
14 articles.
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