Toward heralded distribution of polarization entanglement

Article Article scientifique Article Toward heralded distribution of polarization entanglement eng 2024-06-17 2024-06-17 author Marcellino Iii Francis Joseph 0009-0003-4613-0898 402453 Serv com physique appliquée (FIGCO) author Caspar Patrik author Brydges Tiff 0000-0001-5239-9752 955775 Serv com physique appliquée (FIGCO) author Zbinden Hugo 0000-0002-9237-1700 29543 Serv com physique appliquée (FIGCO) author Thew Rob 0000-0003-0188-6053 541344 Serv com physique appliquée (FIGCO) 181-188 10.1364/OPTICAQ.515316 2837-6714 https://opg.optica.org/abstract.cfm?URI=opticaq-2-3-181 <p>Distributing entangled states over potentially long distances provides a key resource for many protocols in quantum communication and quantum cryptography. Ideally, this should be implemented in a heralded manner. Starting with four single-photon states, we cascade two single-photon path-entangled states, coded in orthogonal polarizations, to distribute and herald polarization entanglement in a single quantum repeater link architecture. By tuning the input states to minimize (local) losses, the theoretically achievable fidelity to the target state without postselection approaches 1, while sacrificing heralding rates. We achieve a fidelity to the target state of over 95% after postselection, providing a benchmark for the experimental control and allowing a first demonstration of a device-independent quantum key distribution architecture capable of operation over relevant distances. We show that the fidelity of the heralded state without postselection scales predictably and also identify various practical challenges and error sources specific to this architecture, and model their effects on the generated state. While our experiment uses probabilistic photon-pair sources based on spontaneous parametric downconversion, many of these problems are also relevant for variants employing deterministic photon sources.</p> Dewey 500.2 Swiss National Science Foundation Experimental Quantum Communication Networks 182664 CH Projects National Center of Competence in Research Quantum Science and Technology Swiss State Secretariat for Research and Innovation (SERI) 35 Groupe de physique appliquée 135 false 1404 Groupe Thew Optica Quantum 2 3 0f0ad9b3-78ed-4ebf-8b32-9e0e11ad1b2b Article (Published version) Public opticaq-2-3-181.pdf 1819045 application/pdf OA OTHER 631bb6ddf79c99105af7e31c1ef282cbde9769d09ba1b5bcb9bad29c72570532 openAccess Faculté des sciences / Section de physique / Groupe de physique appliquée

Title	Published in	Access level	OA Policy	Year	Views	Downloads

Toward heralded distribution of polarization entanglement	Optica Quantum			2024	225	636

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Marcellino Iii, Francis

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