Picture of boy being examining by doctor at a tuberculosis sanatorium

Understanding our future through Open Access research about our past...

Strathprints makes available scholarly Open Access content by researchers in the Centre for the Social History of Health & Healthcare (CSHHH), based within the School of Humanities, and considered Scotland's leading centre for the history of health and medicine.

Research at CSHHH explores the modern world since 1800 in locations as diverse as the UK, Asia, Africa, North America, and Europe. Areas of specialism include contraception and sexuality; family health and medical services; occupational health and medicine; disability; the history of psychiatry; conflict and warfare; and, drugs, pharmaceuticals and intoxicants.

Explore the Open Access research of the Centre for the Social History of Health and Healthcare. Or explore all of Strathclyde's Open Access research...

Image: Heart of England NHS Foundation Trust. Wellcome Collection - CC-BY.

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

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. ISSN 2041-1723

[img]
Preview
Text (Clarke-etal-NC-2012-demonstration-of-quantum-digital-signatures-using-phase-encoded-coherent-states-of-light)
Clarke_etal_NC_2012_demonstration_of_quantum_digital_signatures_using_phase_encoded_coherent_states_of_light.pdf
Final Published Version
License: Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 logo

Download (1MB) | Preview

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.