Entanglement manipulation through multicore fibres

Year: 2024

Authors: Marconi C., Fanella E., Bacco D., Zavatta A.

Autors Affiliation: Ist Nazl Ottica Consiglio Nazl Ric CNR INO, I-50125 Florence, Italy; Univ Napoli Federico II, Naples, Italy; Univ Florence, Dept Phys & Astron, I-50019 Florence, Italy.

Abstract: Multicore fibres are recently gaining considerable attention in the context of quantum communication, where their capability to transmit multiple quantum states along different cores of the same channel makes them a promising candidate for the implementation of scalable quantum networks. Here, we show that multicore fibres can be effectively used not only for the scope of communication but also for the manipulation of entangled states. Exploiting the formalism of completely positive trace-preserving maps, we describe the action of a multicore fibre as a quantum channel and investigate the propagation of a transmitted state under the effect of decoherence and inter-core crosstalk. Then, we propose a novel protocol for the manipulation of the entanglement where, starting from a maximally entangled state of two qudits, we use a multicore fibre to create new families of mixed entangled states. Notably, the presence of crosstalk is fundamental for the generation of such states.

Journal/Review: PHYSICA SCRIPTA

Volume: 99 (11)      Pages from: 115117-1  to: 115117-9

More Information: This research has been co-funded by the European Union-NextGeneration EU, ’Integrated infrastructure initiative in Photonic and Quantum Sciences’ – I-PHOQS [IR0000016, ID D2B8D520, CUP B53C22001750006], by the European Union ERC StG, QOMUNE, 101077917, by the Project SERICS (PE00000014) and STARTrAP (P2022LB47E) under the MUR National Recovery and Resilience Plan funded by the European Union-NextGenerationEU, by the Project QuONTENT under the Progetti di Ricerca, CNR program funded by the Consiglio Nazionale delle Ricerche (CNR), by the European Union-PON Ricerca e Innovazione 2014-2020 FESR-Project ARS01/00734 QUANCOM and by the Project QUID (Quantum Italy Deployment) funded by the European Commission in the Digital Europe Programme under the grant agreement No 101091408.
KeyWords: multicore fibres; entanglement; bound entanglement; quantum channels; quantum communication
DOI: 10.1088/1402-4896/ad848e