title: Semiquantum key distribution with secure delegated quantum computation.
abstract: Semiquantum key distribution allows a quantum party to share a random key with a "classical" party who only can prepare and measure qubits in the computational basis or reorder some qubits when he has access to a quantum channel. In this work, we present a protocol where a secret key can be established between a quantum user and an almost classical user who only needs the quantum ability to access quantum channels, by securely delegating quantum computation to a quantum server. We show the proposed protocol is robust even when the delegated quantum server is a powerful adversary, and is experimentally feasible with current technology. As one party of our protocol is the most quantum-resource efficient, it can be more practical and significantly widen the applicability scope of quantum key distribution.
authors.affiliation: College of Information Engineering, Xiangtan University, Xiangtan 411105, China.|Department of Mathematics and Information Technology, The Hong Kong Institute of Education, Hong Kong.
authors.forename: Qin
authors.initials: Q
authors.lastname: Li
authors.affiliation: Department of Mathematics and Information Technology, The Hong Kong Institute of Education, Hong Kong.
authors.forename: Wai Hong
authors.initials: WH
authors.lastname: Chan
authors.affiliation: Department of Computer Science and Engineering, The Chinese University of Hong Kong, Hong Kong.
authors.forename: Shengyu
authors.initials: S
authors.lastname: Zhang
references.citation: Science. 2012 Jan 20;335(6066):303-8
references.pmid: 22267806
references.citation: Nat Commun. 2014;5:3074
references.pmid: 24445949
references.citation: Sci Rep. 2015 Jan 15;5:7815
references.pmid: 25588565
references.citation: Phys Rev Lett. 2007 Oct 5;99(14):140501
references.pmid: 17930654
references.citation: Phys Rev Lett. 2015 Nov 27;115(22):220502
references.pmid: 26650284
references.citation: Opt Express. 2008 Nov 10;16(23):18790-7
references.pmid: 19581967
references.citation: Phys Rev Lett. 2013 Jul 12;111(2):020502
references.pmid: 23889375
references.citation: Phys Rev Lett. 2013 Dec 6;111(23):230502
references.pmid: 24476239
references.citation: Phys Rev Lett. 2013 Dec 6;111(23):230501
references.pmid: 24476238
references.citation: Phys Rev Lett. 2012 Dec 7;109(23):230502
references.pmid: 23368174
references.citation: Phys Rev Lett. 2012 May 18;108(20):200502
references.pmid: 23003133
references.citation: Nat Commun. 2012;3:1036
references.pmid: 22948818