Polarization Entanglement by Time-Reversed Hong-Ou-Mandel Interference

Yuanyuan Chen, Sebastian Ecker, Sören Wengerowsky, Lukas Bulla, Siddarth Koduru Joshi, Fabian Steinlechner, Rupert Ursin

Research output: Contribution to journalArticle (Academic Journal)peer-review

36 Citations (Scopus)


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.

Original languageEnglish
Article number200502
JournalPhysical Review Letters
Issue number20
Publication statusPublished - 14 Nov 2018

Structured keywords

  • Photonics and Quantum


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