TY - GEN
TI - Single-emitter quantum key distribution over 175 km of fiber with optimised finite key rates
AU - Morrison, Christopher L.
AU - Pousa, Roberto G.
AU - Graffitti, Francesco
AU - Koong, Zhe Xian
AU - Barrow, Peter
AU - Stoltz, Nick G.
AU - Bouwmeester, Dirk
AU - Jeffers, John
AU - Oi, Daniel K. L.
AU - Gerardot, Brian D.
AU - Fedrizzi, Alessandro
AB - Quantum key distribution with solid-state single-photon emitters is gaining traction due to their rapidly improving performance and compatibility with future quantum network architectures. In this work, we perform fibre-based quantum key distribution with a quantum dot frequency-converted to telecom wavelength, achieving count rates of 1.6 MHz with $g^{\left(2\right)}\left(0\right) = 3.6 \%$. We demonstrate positive key rates up to 175 km in the asymptotic regime. We then show that the community standard analysis for non-decoy state QKD drastically overestimates the acquisition time required to generate secure finite keys. Our improved analysis using the multiplicative Chernoff bound reduces the required number of received signals by a factor of $10^8$ over existing work, with the finite key rate approaching the asymptotic limit at all achievable distances for acquisition times of one hour. Over a practical distance of 100 km we achieve a finite key rate of 13 kbps after one minute of integration time. This result represents major progress towards the feasibility of long-distance single-emitter QKD networks.
DA - 2022/09/07/
PY - 2022
DO - 10.48550/arXiv.2209.03394
DP - arXiv.org
PB - arXiv
UR - http://arxiv.org/abs/2209.03394
Y2 - 2022/09/13/08:03:44
KW - Brian Gerardot
KW - QPL
KW - Quantum Physics
KW - quantum emitter
ER -