During this time the system achieved world records in both the total amount of secure key data (878 Gbit) and the speed of transmitting the key data (25.8 Gbit per day average) for an installed system, while remaining stable and completely autonomous.
Quantum encryption provides a previously impossible level of security to the transmission of information through a network by exploiting the quantum nature of single photons of light to detect eavesdropping and guarantee security, a cryptographic technology known as quantum key distribution.
The techniques used in the cutting edge field of quantum communication – the transmission and detection of single photons of light after long distance transmission through optical fibres – requires overcoming a number of technical challenges including suppression of noise and accurate alignment and synchronisation.
To overcome these technical challenges Toshiba has developed automatic stabilisation systems and integrated electronics to compensate, resulting in the 45km 14.5 DB loss obtained in the Otemachi-Koganei demonstration.
34 days is not the limit – the system was still operating correctly at the completion of this 34 day period – and no reasons were seen to suggest operation for much longer periods would not be possible.
The daily average amount of secure key data distributed during this period was 25.8 Gbit (with 878 Gbit secure key data in total over 34 days) with an average transmission speed of 300 kbps, setting new records for both the total secure key data distributed and records for the rates per second and per day for any installed system.
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