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Proceedings Paper

An approach to experimental photonic quantum digital signatures in fiber
Author(s): Ross J. Donaldson; Robert J. Collins; Vedran Dunjko; Partick J. Clarke; Erika Andersson; John Jeffers; Gerald S. Buller
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Paper Abstract

As society becomes more reliant on electronic communication and transactions, ensuring the security of these interactions becomes more important. Digital signatures are a widely used form of cryptography which allows parties to certify the origins of their communications, meaning that one party, a sender, can send information to other parties in such a way that messages cannot be forged. In addition, messages are transferrable, meaning that a recipient who accepts a message as genuine can be sure that if it is forwarded to another recipient, it will again be accepted as genuine. The classical digital signature schemes currently employed typically rely on computational complexity for security. Quantum digital signatures offer the potential for increased security. In our system, quantum signature states are passed through a network of polarization maintaining fiber interferometers (a multiport) to ensure that recipients will not disagree on the validity of a message. These signatures are encoded in the phase of photonic coherent states and the choice of photon number, signature length and number of possible phase states affects the level of security possible by this approach. We will give a brief introduction into quantum digital signatures and present results from our experimental demonstration system.

Paper Details

Date Published: 29 October 2013
PDF: 10 pages
Proc. SPIE 8899, Emerging Technologies in Security and Defence; and Quantum Security II; and Unmanned Sensor Systems X, 88990X (29 October 2013); doi: 10.1117/12.2028720
Show Author Affiliations
Ross J. Donaldson, Heriot-Watt Univ. (United Kingdom)
Robert J. Collins, Heriot-Watt Univ. (United Kingdom)
Vedran Dunjko, Heriot-Watt Univ. (United Kingdom)
Edinburgh Univ. (United Kingdom)
Institut Ruder Boškovic (Croatia)
Partick J. Clarke, Heriot-Watt Univ. (United Kingdom)
BeiHang Univ. (China)
Erika Andersson, Heriot-Watt Univ. (United Kingdom)
John Jeffers, Univ. of Strathclyde (United Kingdom)
Gerald S. Buller, Heriot-Watt Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 8899:
Emerging Technologies in Security and Defence; and Quantum Security II; and Unmanned Sensor Systems X
Edward M. Carapezza; Keith L. Lewis; Mark T. Gruneisen; Miloslav Dusek; Richard C. Hollins; Thomas J. Merlet; John G. Rarity, Editor(s)

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