Project description DEENESFRITPL Going the distance may get a boost from a novel repeater architecture The movement of electrons and photons underlies the transfer of information in conventional electrical and optical communication systems. Information is literally carried over long distances by the movement of these tiny particles in overground, underground and even subsea electrical and fibre-optic cables. Quantum communication takes advantage of quantum entanglement and teleportation, transferring matter or energy from one point to another without physically traversing the distance. Like conventional amplifiers at intermediate ‘nodes’ to reach long distances, quantum communication relies on quantum repeaters. Two concepts have emerged to realise quantum repeaters; however, they have not yet been investigated as a hybrid system combining the strengths of each. The EU-funded project QUREP has set out to do just that via combined theoretical and experimental studies, investigating for the first time an interconnected system of two disparate solid-state resources for quantum communication. Show the project objective Hide the project objective Objective At the heart of all anticipated network-based quantum applications lies the requirement to establish quantum communication between individual network nodes over long distances. Quantum communication exceeding 100 km requires so-called quantum repeaters to extend communication beyond this limit. Mainly two types of quantum repeater schemes are being investigated: Quantum-memory-based schemes for long-distant entanglement generation and photonic encoding-based schemes for fast secure quantum communication. To date, both schemes have only been considered individually, however, a hybrid approach could overcome their distinct limitations and benefit from individual advantages. How such a system could be realized remains an open question.This project addresses the challenges, benefits, and resource requirements for a hybrid architecture of interconnected photonic-cluster-state-based and quantum-memory-based quantum repeaters. In a theoretical study, cost parameters of such a hybrid quantum repeater for realistic system properties will be determined for the first time. Experimentally, electron spin coupled quantum dot single photon sources will be employed as resource for multi-photon cluster state generation. In parallel, a new type of quantum memory—the SnV defect in diamond, will serve to demonstrate remote entanglement. Finally, these two disparate systems will be interconnected via frequency conversion and Bell-measurements—to demonstrate cross-platform entanglement. Investigating for the first time an interconnected system of two disparate solid-state resources for quantum communication will stimulate ground-breaking research towards hybrid quantum repeater architectures.All three objectives will benefit from the PI’s recent expertise in spectroscopy, spin control, and nanofabrication of gallium arsenide quantum dots and diamond defect centres in integrated photonic structures. Fields of science natural scienceschemical sciencesinorganic chemistrypost-transition metalsnatural sciencesphysical sciencestheoretical physicsparticle physicsphotonsnatural sciencesphysical sciencesopticsspectroscopy Programme(s) H2020-EU.1.1. - EXCELLENT SCIENCE - European Research Council (ERC) Main Programme Topic(s) ERC-2019-STG - ERC Starting Grant Call for proposal ERC-2019-STG See other projects for this call Funding Scheme ERC-STG - Starting Grant Coordinator HUMBOLDT-UNIVERSITAET ZU BERLIN Net EU contribution € 1 500 000,00 Address Unter den linden 6 10117 Berlin Germany See on map Region Berlin Berlin Berlin Activity type Higher or Secondary Education Establishments Links Contact the organisation Opens in new window Website Opens in new window Participation in EU R&I programmes Opens in new window HORIZON collaboration network Opens in new window Other funding € 0,00 Beneficiaries (1) Sort alphabetically Sort by Net EU contribution Expand all Collapse all HUMBOLDT-UNIVERSITAET ZU BERLIN Germany Net EU contribution € 1 500 000,00 Address Unter den linden 6 10117 Berlin See on map Region Berlin Berlin Berlin Activity type Higher or Secondary Education Establishments Links Contact the organisation Opens in new window Website Opens in new window Participation in EU R&I programmes Opens in new window HORIZON collaboration network Opens in new window Other funding € 0,00
