China’s first citywide commercial communications system using “unhackable” quantum technology is expected to be up and running next month, mainland media reported on Sunday. Tests on the system in Jinan in the east province of Shandong had been completed and the network would start operations next month to provide extremely secure communication for nearly 200 users, state-run China Central Television reported. Zhou Fei, assistant to the director at the Jinan Institute of Quantum Technology, said the first users would be in the government, military, finance and electricity sectors. The quantum network uses particles of light to encrypt information. If a third party tries to intercept the information, the particles change characteristics, making it impossible to steal the information without alerting the network. It is understood to be impossible for any computer to decipher a message encrypted by a quantum key, according to the South China Morning Post.