Reducing the cost of delivering a QKD service to end users can be achieved using a Quantum Access Network in which many users are served by a single quantum receiver. In this configuration multiple users share a single photon detector. Only cheaper components are required by the customers transmitting to the quantum reciever. A standard passive optical fibre combiner is used, as widely deployed in fibre-to-the-business and fibre-to-the-home applications.
Toshiba pioneered the development of high performance quantum encryption systems. We were the first to demonstrate Megabit per second sustained key rates and transmission over 100 km of fibre, opening up a wide range of new applications. Core to Toshiba’s success is proprietary weak light detection technology allowing for faster, more efficient key exchange.