Steering-based randomness certification with squeezed states and homodyne measurements
Marie Ioannou, Bradley Longstaff, Mikkel V. Larsen, Jonas S. Neergaard-Nielsen, Ulrik L. Andersen, Daniel Cavalcanti, Nicolas Brunner, Jonatan Bohr Brask
Abstract
High-quality randomness, certified to be unpredictable by eavesdroppers, is key to secure information processing. Quantum mechanics enables randomness certification with minimal trust in the devices used, by exploiting quantum nonlocality. However, such full device independence is challenging to implement. We present a scheme for quantum randomness certification based on quantum steering. The protocol is one-sided device independent, providing high security, but requires only states and measurements that are simple to realize on quantum optics platforms---squeezed vacuum states and homodyne detection. This ease of implementation is demonstrated experimentally and implies that gigahertz random bit rates should be attainable with current technology. Furthermore, our scheme is immune to the detection loophole and represents the closest to full device independence that can be achieved using purely Gaussian states and measurements.