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Supplement 1: Long-distance quantum key distribution secure against coherent attacks

Bernd Fröhlich, Marco Lucamarini, J. F. Dynes +6 more

Methods Originally published in Optica on 20 January 2017 (optica-4-1-163)

Jan 1, 20170 citations

Supplement 1: Integrated silicon photonics for high-speed quantum key distribution

Philip Sibson, Jake Kennard, Stasja Stanisic +3 more

Supplementary Material Originally published in Optica on 20 February 2017 (optica-4-2-172)

Jan 1, 20170 citations

Supplement 1: Silicon photonic transmitter for polarization-encoded quantum key distribution

Chaoxuan Ma, Wesley D. Sacher, Zhiyuan Tang +6 more

Supplemental document containing additional details. Originally published in Optica on 20 November 2016 (optica-3-11-1274)

Jan 1, 20160 citations

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

Nathan Walk, Sara Hosseini, Jiao Geng +9 more

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 steering plays a key role in one-sided device-independent quantum key distribution (1sDI-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 km and 3.5 km of optical fiber transmission respectively. We also engage in detailed modelling 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 CVQKD systems in a significantly more secure setting.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 steering plays a key role in one-sided device-independent quantum key distribution (1sDI-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 km and 3.5 km of optical fiber transmission respectively. We also engage in detailed modelling 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 CVQKD systems in a significantly more secure setting.

arXiv:1405.6593OpticaJun 8, 2016214 citations

Generalized Approach for Analysing Quantum Key Distribution Experiments

Arpita Maitra, Suvra Sekhar Das

Lecture notes in computer scienceJan 1, 20190 citations

Supplement 1: Quantum-enhanced tomography of unitary processes

Xiao-Qi Zhou, Hugo V. Cable, Rebecca Whittaker +3 more

Originally published in Optica on 20 June 2015 (optica-2-6-510)

Jan 1, 20150 citations

Supplement 1: Experimental demonstration of Gaussian protocols for one-sided device-independent quantum key distribution

Abstract

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Supplement 1: Experimental demonstration of Gaussian protocols for one-sided device-independent quantum key distribution

Abstract

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