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dc.contributor.authorKoehler-Sidki, Alexanderen
dc.contributor.authorLucamarini, Men
dc.contributor.authorDynes, JFen
dc.contributor.authorRoberts, Georgeen
dc.contributor.authorSharpe, AWen
dc.contributor.authorYuan, Zen
dc.contributor.authorShields, AJen
dc.date.accessioned2018-12-11T11:43:12Z
dc.date.available2018-12-11T11:43:12Z
dc.identifier.issn2469-9926
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/286671
dc.description.abstractQuantum key distribution is rising as an important cryptographic primitive for protecting the communication infrastructure in the digital era. However, its implementation security is often weakened by components whose behavior deviates from what is expected. Here we analyze the response of a self-differencing avalanche photodiode, a key enabler for high speed quantum key distribution, to intense light shone from a continuous-wave laser. Under incorrect settings, the cancellation entailed by the self-differencing circuitry can make the detector insensitive to single photons. However, we experimentally demonstrate that even in such cases intensity modulation can be used as an effective measure to restore the detector's expected response to the input light.
dc.description.sponsorshipA.K.-S. gratefully acknowledges financial support from Toshiba Research Europe Ltd. and the Engineering and Physical Sciences Research Council (EPSRC) through an Industrial CASE studentship Grant No. NMZE\187 (RG84410).
dc.publisherAmerican Physical Society
dc.titleIntensity modulation as a preemptive measure against blinding of single-photon detectors based on self-differencing cancellationen
dc.typeArticle
prism.issueIdentifier2en
prism.number022327en
prism.publicationNamePhysical Review Aen
prism.volume98en
dc.identifier.doi10.17863/CAM.33980
dcterms.dateAccepted2018-08-03en
rioxxterms.versionofrecord10.1103/PhysRevA.98.022327en
rioxxterms.versionAM*
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2018-08-03en
dc.contributor.orcidRoberts, George [0000-0002-7318-0669]
dc.identifier.eissn2469-9934
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idEPSRC (1678703)
cam.issuedOnline2018-08-22en


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