A future Quantum Computer would allow to break public key systems like RSA. Ironically, quantum physics offers also an alternative way to distribute keys, Quantum Key Distribution, which can be shown to be information theoretically secure. Hugo Zbinden gives a short introduction on QKD and overview of the state of the art. He presents a so-called self-testing Quantum Random Number generator (QRNG), which has the unique feature that the generated entropy can be measured in real time. | Hugo Zbinden ist Professor an der Universität Genf und leitet die Quantum Technologies Group.