They are attempting to get quantum cryptography using Quantum Key Distribution into smartphones, requiring only the integration of an optical chip into a mobile handset.
The university reports that the work relies on the breakthrough protocol developed by CQP research fellow Dr Anthony Laing, and colleagues, which allows the robust exchange of quantum information through an unstable environment. The research is published in the latest issue of Physical Review Letters.
"With much attention currently focused on privacy and information security, people are looking to quantum cryptography as a solution since its security is guaranteed by the laws of physics," said Dr Laing.
"Our work here shows that quantum cryptography need not be limited to large corporations, but could be made available to members of the general public. The next step is to take our scheme out of the lab and deploy it in a real communications network."
The university writes:
The system uses photons - single particles of light - as the information carrier and the scheme relies on the integrated quantum circuits developed at the University of Bristol. These tiny microchips are crucial for the widespread adoption of secure quantum communications technologies and herald a new dawn for secure mobile banking, online commerce, and information exchange and could shortly lead to the production of the first 'NSA proof' mobile phone.
Paper: Reference frame independent quantum key distribution server with telecom tether for on-chip client by P. Zhang, K. Aungskunsiri, E. Martín-López, J. Wabnig, M. Lobino, R. W. Nock, J. Munns, D. Bonneau, P. Jiang, H. W. Li, A. Laing, J. G. Rarity, A. O. Niskanen, M. G. Thompson, J. L. O'Brien in Physical Review Letters, 2 April 2014.