Spectrally separable photon-pair generation in dispersion engineered thin-film lithium niobate
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 ) % .
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- May 26, 2022
- Source ID
- 10.1364/ol.456873
Entities
People
- Amirhassan Shams-Ansari
- C. J. Xin
- Carsten Langrock
- Changchen Chen
- Di Zhu
- Franco N. C. Wong
- Jatadhari Mishra
- M. M. Fejer
- Marko Loncar
- Neil Sinclair
Organizations
- Army Research Office
- California Institute of Technology
- Harvard University
- Massachusetts Institute of Technology
- NTT, Inc.
- National Center for Research Resources
- National Science Foundation
- Stanford University
- United States Department of Energy