Experimental demonstration of Gaussian protocols for one-sided device-independent quantum key distribution

Walk, Nathan, Hosseini, Sara, Geng, Jiao, Thearle, Oliver, Haw, Jing Yan, Armstrong, Seiji, Assad, Syed M., Janousek, Jiri, Ralph, Timothy C., Symul, Thomas, Wiseman, Howard M. and Lam, Ping Koy (2016) Experimental demonstration of Gaussian protocols for one-sided device-independent quantum key distribution. Optica, 3 6: 634-642. doi:10.1364/OPTICA.3.000634


Author Walk, Nathan
Hosseini, Sara
Geng, Jiao
Thearle, Oliver
Haw, Jing Yan
Armstrong, Seiji
Assad, Syed M.
Janousek, Jiri
Ralph, Timothy C.
Symul, Thomas
Wiseman, Howard M.
Lam, Ping Koy
Title Experimental demonstration of Gaussian protocols for one-sided device-independent quantum key distribution
Journal name Optica   Check publisher's open access policy
ISSN 2334-2536
Publication date 2016-06-20
Year available 2016
Sub-type Article (original research)
DOI 10.1364/OPTICA.3.000634
Open Access Status Not yet assessed
Volume 3
Issue 6
Start page 634
End page 642
Total pages 8
Place of publication Washington, DC United States
Publisher Optical Society of America
Collection year 2017
Language eng
Abstract Nonlocal correlations, a longstanding foundational topic in quantum information, have recently found application as a resource for cryptographic tasks where not all devices are trusted, for example, in settings with a highly secure central hub, such as a bank or government department, and less secure satellite stations, which are inherently more vulnerable to hardware “hacking” attacks. The asymmetric phenomena of Einstein–Podolsky–Rosen (EPR) steering plays a key role in one-sided device-independent (1sDI) quantum key distribution (QKD) protocols. In the context of continuous-variable (CV) QKD schemes utilizing Gaussian states and measurements, we identify all protocols that can be 1sDI and their maximum loss tolerance. Surprisingly, this includes a protocol that uses only coherent states. We also establish a direct link between the relevant EPR steering inequality and the secret key rate, further strengthening the relationship between these asymmetric notions of nonlocality and device independence. We experimentally implement both entanglement-based and coherent-state protocols, and measure the correlations necessary for 1sDI key distribution up to an applied loss equivalent to 7.5 and 3.5 km of optical fiber transmission, respectively. We also engage in detailed modeling to understand the limits of our current experiment and the potential for further improvements. The new protocols we uncover apply the cheap and efficient hardware of CV-QKD systems in a significantly more secure setting.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
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