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Entanglement Swapping with Photons Generated on Demand by a Quantum Dot
Sapienza Univ Rome, Dept Phys, I-00185 Rome, Italy..
Sapienza Univ Rome, Dept Phys, I-00185 Rome, Italy..
Johannes Kepler Univ Linz, Inst Semicond & Solid State Phys, A-4040 Linz, Austria..
Sapienza Univ Rome, Dept Phys, I-00185 Rome, Italy..
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2019 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 123, no 16, article id 160501Article in journal (Refereed) Published
Abstract [en]

Photonic entanglement swapping, the procedure of entangling photons without any direct interaction, is a fundamental test of quantum mechanics and an essential resource to the realization of quantum networks. Probabilistic sources of nonclassical light were used for seminal demonstration of entanglement swapping, but applications in quantum technologies demand push-button operation requiring single quantum emitters. This, however, turned out to be an extraordinary challenge due to the stringent prerequisites on the efficiency and purity of the generation of entangled states. Here we show a proof-of-concept demonstration of all-photonic entanglement swapping with pairs of polarization-entangled photons generated on demand by a GaAs quantum dot without spectral and temporal filtering. Moreover, we develop a theoretical model that quantitatively reproduces the experimental data and provides insights on the critical figures of merit for the performance of the swapping operation. Our theoretical analysis also indicates how to improve stateof-the-art entangled-photon sources to meet the requirements needed for implementation of quantum dots in long-distance quantum communication protocols.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2019. Vol. 123, no 16, article id 160501
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-262938DOI: 10.1103/PhysRevLett.123.160501ISI: 000489831500001Scopus ID: 2-s2.0-85073813116OAI: oai:DiVA.org:kth-262938DiVA, id: diva2:1374326
Note

QC 20191129

Available from: 2019-11-29 Created: 2019-11-29 Last updated: 2019-11-29Bibliographically approved

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Zeuner, KatharinaZwiller, ValJöns, Klaus D.

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