An in fiber experimental approach to photonic quantum digital signatures that does not require quantum memory

Robert J. Collins, Ross J Donaldson, Vedran Dunjko, Petros Wallden, Patrick J. Clarke, Erika Andersson, John Jeffers, Gerald S. Buller

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


Classical digital signatures are commonly used in e-mail, electronic financial transactions and other forms of electronic communications to ensure that messages have not been tampered with in transit, and that messages are transferrable. The security of commonly used classical digital signature schemes relies on the computational difficulty of inverting certain mathematical functions. However, at present, there are no such one-way functions which have been proven to be hard to invert. With enough computational resources certain implementations of classical public key cryptosystems can be, and have been, broken with current technology. It is nevertheless possible to construct information-theoretically secure signature schemes, including quantum digital signature schemes. Quantum signature schemes can be made information-theoretically secure based on the laws of quantum mechanics, while classical comparable protocols require additional resources such as secret communication and a trusted authority.

Early demonstrations of quantum digital signatures required quantum memory, rendering them impractical at present. Our present implementation is based on a protocol that does not require quantum memory. It also uses the new technique of unambiguous quantum state elimination, Here we report experimental results for a test-bed system, recorded with a variety of different operating parameters, along with a discussion of aspects of the system security.

Original languageEnglish
Title of host publicationEmerging Technologies in Security and Defence II; and Quantum-Physics-Based Information Security III
EditorsMT Gruneisen, M Dusek, JG Rarity, KL Lewis, RC Hollins, TJ Merlet, A Toet
Place of PublicationBellingham
Number of pages10
Publication statusPublished - 2014
EventConference on Emerging Technologies in Security and Defence II; and Quantum-Physics-based Information Security III - Amsterdam, Netherlands
Duration: 22 Sep 201423 Sep 2014

Publication series

NameProceedings of SPIE
ISSN (Print)0277-786X


ConferenceConference on Emerging Technologies in Security and Defence II; and Quantum-Physics-based Information Security III


  • Quantum communications
  • digital signature
  • cryptography
  • quantum memory
  • quantum state elimination
  • SI-28
  • LONG

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