Heralding Multiple Photonic Pulsed Bell Pairs via Frequency-Resolved Entanglement Swapping

Sofiane Merkouche, Valérian Thiel, Alex O.C. Davis, Brian J. Smith

Research output: Contribution to journalArticlepeer-review

11 Citations (SciVal)


Entanglement is a unique property of quantum systems and an essential resource for many quantum technologies. The ability to transfer or swap entanglement between systems is an important protocol in quantum information science. Entanglement swapping between photons forms the basis of distributed quantum networks. Here an experiment demonstrating entanglement swapping from two independent multimode time-frequency entangled sources is presented, resulting in multiple heralded frequency-mode Bell states. Entanglement in the heralded states is verified by measuring conditional anticorrelated joint spectra and quantum beating in two-photon interference. Our experiment heralds up to five orthogonal Bell pairs within the same setup, and this number is ultimately limited only by the entanglement of the initial sources.

Original languageEnglish
Article number063602
JournalPhysical Review Letters
Issue number6
Publication statusPublished - 11 Feb 2022

Bibliographical note

Funding Information:
This project has received funding from the European Union’s Horizon 2020 research and innovation program under Grant Agreement No. 665148, the United Kingdom Defense Science and Technology Laboratory (DSTL) under Contract No. DSTLX-100092545, and the National Science Foundation under Grant No. 1839216.

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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