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

Clarke, Patrick and Collins, Robert and Dunjko, Vedran and Andersson, Anna Erika and Jeffers, John and Buller, G.S. (2012) Experimental demonstration of quantum digital signatures using phase-encoded coherent states of light. Nature Communications, 3. ISSN 2041-1723

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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.

Item type: Article
ID code: 42180
Keywords: experimental demonstration , quantum digital signatures , phase-encoded coherent, states of light, Physics, Chemistry, Biochemistry, Genetics and Molecular Biology(all), Chemistry(all), Physics and Astronomy(all)
Subjects: Science > Physics
Science > Chemistry
Department: Faculty of Science > Physics
Related URLs:
Depositing user: Pure Administrator
Date Deposited: 23 Nov 2012 15:50
Last modified: 27 Mar 2014 10:43
URI: http://strathprints.strath.ac.uk/id/eprint/42180

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