Experimental demonstration of quantum digital signatures using phase-encoded coherent states of light

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Clarke, Patrick J. and Collins, Robert J. and Dunjko, Vedran and Andersson, Erika and Jeffers, John and Buller, Gerald S. (2012) Experimental demonstration of quantum digital signatures using phase-encoded coherent states of light. Nature Communications, 3. 1174. ISSN 2041-1723 (https://doi.org/10.1038/ncomms2172)

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Abstract

Digital signatures are frequently used in data transfer to prevent impersonation, repudiation and message tampering. Currently used classical digital signature schemes rely on public key encryption techniques, where the complexity of so-called ‘one-way’ mathematical functions is used to provide security over sufficiently long timescales. No mathematical proofs are known for the long-term security of such techniques. Quantum digital signatures offer a means of sending a message, which cannot be forged or repudiated, with security verified by information-theoretical limits and quantum mechanics. Here we demonstrate an experimental system, which distributes quantum signatures from one sender to two receivers and enables message sending ensured against forging and repudiation. Additionally, we analyse the security of the system in some typical scenarios. Our system is based on the interference of phase-encoded coherent states of light and our implementation utilizes polarization-maintaining optical fibre and photons with a wavelength of 850 nm.

ORCID iDs

Clarke, Patrick J., Collins, Robert J., Dunjko, Vedran, Andersson, Erika, Jeffers, John ORCID logoORCID: https://orcid.org/0000-0002-8573-1675 and Buller, Gerald S.;
  • Item type:Article
    ID code:42180
    Dates:
    Date
    Event
    6 November 2012
    Published
    6 November 2012
    Published Online
    26 September 2012
    Accepted
    Subjects:Science > Physics
    Science > Chemistry
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:23 Nov 2012 15:50
    Last modified:22 Dec 2024 01:14
    URI:https://strathprints.strath.ac.uk/id/eprint/42180
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