Quantum Information Group, Toshiba’s Quantum Cryptography Prototype
The Toshiba Quantum Crypto System consists of two compact units, designed to fit into a standard communications rack. These are located at the sender’s and the receiver’s site and linked by an ordinary telecom fibre optic cable. In this first prototype, the photons are generated by a strongly attenuated pulsed laser diode and are detected by custom-developed avalanche photo-diodes.
Toshiba have pioneered techniques to extend the range and bit rate of quantum cryptography. They were the first to report quantum key distribution over 100km of standard optical fibre. More recently they have extended the distance for full key distribution to 122km (see reference below), and the distance for single photon interference to 165km - both world records.
Toshiba’s most recent innovation is to introduce a proprietary auto-alignment technology, which greatly simplifies use. It allows the system to self-initiate and to operate continuously without any human management. Tests performed on installed fibre have demonstrated uninterrupted key generation sessions of up to one week.
Further Reading
Terms and Conditions
