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Title: Asynchronous reference frame agreement in a quantum network
Authors: Islam T. 
Wehner S. 
Keywords: Physics
Arbitrary delays
Asynchronous networks
Asynchronous protocols
Efficient implementation
Multi-party protocols
Quantum network
Reference frame
Robust protocol
Issue Date: 2016
Publisher: Institute of Physics Publishing
Citation: Islam T., Wehner S. (2016). Asynchronous reference frame agreement in a quantum network. New Journal of Physics 18 (3) : 33018. ScholarBank@NUS Repository.
Abstract: An efficient implementation of many multiparty protocols for quantum networks requires that all the nodes in the network share a common reference frame. Establishing such a reference frame from scratch is especially challenging in an asynchronous network where network links might have arbitrary delays and the nodes do not share synchronised clocks. In this work, we study the problem of establishing a common reference frame in an asynchronous network of n nodes of which at most t are affected by arbitrary unknown error, and the identities of the faulty nodes are not known. We present a protocol that allows all the correctly functioning nodes to agree on a common reference frame as long as the network graph is complete and not more than nodes are faulty. As the protocol is asynchronous, it can be used with some assumptions to synchronise clocks over a network. Also, the protocol has the appealing property that it allows any existing two-node asynchronous protocol for reference frame agreement to be lifted to a robust protocol for an asynchronous quantum network. © 2016 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.
Source Title: New Journal of Physics
ISSN: 1367-2630
DOI: 10.1088/1367-2630/18/3/033018
Appears in Collections:Staff Publications

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