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Quantum repeaters based on trapped ions with decoherence-free subspace encoding
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
 
ID 4138514
Author(s) Zwerger, M.; Lanyon, B. P.; Northup, T. E.; Muschik, C. A.; Dur, W.; Sangouard, N.
Author(s) at UniBasel Sangouard, Nicolas
Year 2017
Title Quantum repeaters based on trapped ions with decoherence-free subspace encoding
Journal Quantum Science and Technology
Volume 2
Number 4
Pages / Article-Number 044001
Abstract Quantum repeaters provide an efficient solution to distribute Bell pairs over arbitrarily long distances. While scalable architectures are demanding regarding the number of qubits that need to be controlled, here we present a quantum repeater scheme aiming to extend the range of present day quantum communications that could be implemented in the near future with trapped ions in cavities. We focus on an architecture where ion-photon entangled states are created locally and subsequently processed with linear optics to create elementary links of ion-ion entangled states. These links are then used to distribute entangled pairs over long distances using successive entanglement swapping operations performed using deterministic ion-ion gates. We show how this architecture can be implemented while encoding the qubits in a decoherence-free subspace to protect them against collective dephasing. This results in a protocol that can be used to violate a Bell inequality over distances of about 800 km assuming state-of-the-art parameters. We discuss how this could be improved to several thousand kilometres in future setups.
Publisher IOP Publishing
ISSN/ISBN 2058-9565
edoc-URL http://edoc.unibas.ch/58185/
Full Text on edoc No
Digital Object Identifier DOI 10.1088/2058-9565/aa7983
Document type (ISI) article
 
   

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