Journal
PHYSICAL REVIEW LETTERS
Volume 121, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.121.200502
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Funding
- Austrian Research Promotion Agency (FFG) Projects-Agentur fur Luft-und Raumfahrt (FFG-ALR) [6238191, 866025]
- European Space Agency (ESA) [4000112591/14/NL/US]
- Austrian Academy of Sciences
- Major Program of National Natural Science Foundation of China [11690030, 11690032]
- National Key Research and Development Program of China [2017YFA0303700]
- National Natural Science Foundation of China [61771236]
- China Scholarship Council (CSC)
- Austrian Science Fund (FWF) [W1210] Funding Source: Austrian Science Fund (FWF)
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Sources of entanglement are an enabling resource in quantum technology, and pushing the limits of generation rate and quality of entanglement is a necessary prerequisite towards practical applications. Here, we present an ultrabright source of polarization-entangled photon pairs based on time-reversed Hong-Ou-Mandel interference. By superimposing four pair-creation possibilities on a polarization beam splitter, pairs of identical photons are separated into two spatial modes without the usual requirement for wavelength distinguishability or noncollinear emission angles. Our source yields high-fidelity polarization entanglement and high pair-generation rates without any requirement for active interferometric stabilization, which makes it an ideal candidate for a variety of applications, in particular those requiring indistinguishable photons.
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