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13th White Rabbit Workshop and Collaboration Launch Event

Jeroen C. J. Koelemeij

Published Jan 1, 2024• 0 citations
OpenAlex

Abstract

White Rabbit applications: terrestrial PNT networks, the Quantum Internet, and networked digital time scales. 0:00:00 Slide 1 0:02:07 Slide 2 0:03:42 Slide 3 0:06:07 Slide 4 0:07:17 Slide 5 0:08:45 Slide 6 0:10:31 Slide 7 0:11:59 Slide 8 0:13:29 Slide 9 0:15:56 Slide 10 0:17:19 Slide 11 0:20:37 Slide 12 0:21:55 Slide 13 0:23:45 Slide 14 0:25:08 Slide 15 0:26:24 Slide 16

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White Rabbit (WR) technology provides a commercially-available off-the-shelf solution for time synchronisation with sub-nanosecond accuracy and picosecond-level precision over optical fibre links typically spanning tens of kilometres. Such high-performance time dissemination can support a variety of applications, including position, navigation and timing (PNT), financial transactions, metrology, as well as entanglement and quantum key distribution (QKD). Demonstrations of WR over significantly longer distances remain few and far between, particularly in scenarios where intermediate amplification is unavailable, such as stretches of long-haul underwater fibre. In this work, we report the longest unrepeated deployment of WR to date, achieving time synchronisation over a 300 km (51.34 dB) single-span optical fibre link, even in highly asymmetrical configurations, with 99.86% uptime, whilst maintaining picosecond-level precision and sub-nanosecond accuracy. This was achieved through careful selection and optimisation of the components deployed at the link's end points. By leveraging standard telecom fibre and off-the-shelf hardware, our results pave the way for a scalable and standardised timing backbone for large-scale quantum networks, offering a practical route toward time distribution in future heterogeneous quantum communication systems.

quant-pharXiv:2511.23254•Journal of Lightwave Technology•Dec 1, 2025•1 citation
White Rabbit applications: terrestrial PNT networks, the Quantum Internet, and networked digital time scales. 0:00:00 Slide 1 0:02:07 Slide 2 0:03:42 Slide 3 0:06:07 Slide 4 0:07:17 Slide 5 0:08:45 Slide 6 0:10:31 Slide 7 0:11:59 Slide 8 0:13:29 Slide 9 0:15:56 Slide 10 0:17:19 Slide 11 0:20:37 Slide 12 0:21:55 Slide 13 0:23:45 Slide 14 0:25:08 Slide 15 0:26:24 Slide 16
Quantum Communication Networks and the Quantum Flagship. 0:00:00 Slide 1 0:00:50 Slide 2 0:01:27 Slide 3 0:01:35 Slide 4 0:02:13 Slide 5 0:02:30 Slide 6 0:02:44 Slide 7 0:02:54 Slide 8 0:03:06 Slide 9 0:04:06 Slide 10 0:04:38 Slide 11 0:05:11 Slide 12 0:05:37 Slide 13 0:06:01 Slide 14 0:06:19 Slide 15 0:06:45 Slide 16 0:07:01 Slide 17 0:07:43 Slide 18 0:07:50 Slide 19 0:08:34 Slide 20 0:08:55 Slide 21 0:08:59 Slide 22 0:09:06 Slide 23 0:09:10 Slide 24 0:09:18 Slide 25 0:09:44 Slide 26 0:10:01 Slide 27 0:10:28 Slide 28 0:11:00 Slide 29 0:11:42 Slide 30 0:12:20 Slide 31 0:12:27 Slide 32 0:13:04 Slide 33 0:13:17 Slide 34 0:14:14 Slide 35 0:15:10 Slide 36 0:15:22 Slide 37 0:15:55 Slide 38 0:17:08 Slide 39 0:17:34 Slide 40 0:17:46 Slide 41 0:17:56 Slide 42 0:18:07 Slide 43 0:18:42 Slide 44 0:19:02 Slide 45 0:19:27 Slide 46 0:20:02 Slide 47 0:21:05 Slide 48 0:21:11 Slide 49 0:22:06 Slide 50 0:22:10 Slide 51 0:22:14 Slide 52 0:23:19 Slide 53 0:23:36 Slide 54 0:24:18 Slide 55 0:24:48 Slide 56 0:25:37 Slide 57 0:27:14 Slide 58 0:27:39 Slide 59 0:27:52 Slide 60 0:28:22 Slide 61 0:29:04 Slide 62 0:29:43 Slide 63 0:29:47 Slide 64 0:29:51 Slide 65
White Rabbit (WR) technology provides a commercially-available off-the-shelf solution for time synchronisation with sub-nanosecond accuracy and picosecond-level precision over optical fibre links typically spanning tens of kilometres. Such high-performance time dissemination can support a variety of applications, including position, navigation and timing (PNT), financial transactions, metrology, as well as entanglement and quantum key distribution (QKD). Demonstrations of WR over significantly longer distances remain few and far between, particularly in scenarios where intermediate amplification is unavailable, such as stretches of long-haul underwater fibre. In this work, we report the longest unrepeated deployment of WR to date, achieving time synchronisation over a 300 km (51.34 dB) single-span optical fibre link, even in highly asymmetrical configurations, with 99.86% uptime, whilst maintaining picosecond-level precision and sub-nanosecond accuracy. This was achieved through careful selection and optimisation of the components deployed at the link's end points. By leveraging standard telecom fibre and off-the-shelf hardware, our results pave the way for a scalable and standardised timing backbone for large-scale quantum networks, offering a practical route toward time distribution in future heterogeneous quantum communication systems.