Quantum crypto still not proven, claim Cambridge experts

Two killjoy researchers from the University of Cambridge have cast doubt on whether quantum cryptography can be regarded as ‘provably secure’ – and are asking whether today’s quantum computing experimentation is demonstrating classical rather than quantum effects.

Computer scientists Ross Anderson and Robert Brady have published their discussion at Arxiv, here. In the paper, they examine two key issues in quantum research. As well as looking at the cryptography question, they also examine why quantum computing research is finding it hard to scale beyond three qubits.