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Device-independent quantum key distribution with single-photon sources

Jan Kołodyński
(
- Warsaw U. and
- ICFO, Barcelona
)
,
Alejandro Máttar
(
- ICFO, Barcelona
)
,
Paul Skrzypczyk
(
- Bristol U.
)
,
Erik Woodhead
(
- ICFO, Barcelona and
- Brussels U.
)
,
Daniel Cavalcanti
(
- ICFO, Barcelona
)

Apr 30, 2020

20 pages

Published in:

Quantum 4 (2020) 260

Published: Apr 30, 2020

e-Print:

1803.07089

DOI:

10.22331/q-2020-04-30-260

View in:

ADS Abstract Service

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Abstract: (Verein zur Foerderung des Open Access Publizierens in den Quantenwissenschaften)

\textit{Device-independent quantum key distribution}

protocols allow two honest users to establish a secret key with minimal levels of trust on the provider, as security is proven without any assumption on the inner working of the devices used for the distribution. Unfortunately, the implementation of these protocols is challenging, as it requires the observation of a large Bell-inequality violation between the two distant users. Here, we introduce novel photonic protocols for device-independent quantum key distribution exploiting

\textit{single-photon sources}

and

\textit{heralding-type architectures}

. The heralding process is designed so that transmission losses become irrelevant for security. We then show how the use of single-photon sources for entanglement distribution in these architectures, instead of standard entangled-pair generation schemes, provides significant improvements on the attainable key rates and distances over previous proposals. Given the current progress in single-photon sources, our work opens up a promising avenue for device-independent quantum key distribution implementations.

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