LONDON (Reuters) – Britain’s BT and Japan’s Toshiba on Wednesday launched the first commercial trial of a quantum-secured network that will block vulnerabilities in encryption that will emerge when quantum computing becomes mainstream. Professional services group EY will use the network to connect two of its sites in London, one at London Bridge and the other at Canary Wharf, the companies said. Quantum computers are unreliable and costly today but the technology, which is being developed by companies including Google, IBM and Microsoft, offers the potential to crunch data millions of times fa…