Continuous-variable quantum computing in optical time-frequency modes using quantum memories

Phys Rev Lett. 2014 Sep 26;113(13):130502. doi: 10.1103/PhysRevLett.113.130502. Epub 2014 Sep 25.


We develop a scheme for time-frequency encoded continuous-variable cluster-state quantum computing using quantum memories. In particular, we propose a method to produce, manipulate, and measure two-dimensional cluster states in a single spatial mode by exploiting the intrinsic time-frequency selectivity of Raman quantum memories. Time-frequency encoding enables the scheme to be extremely compact, requiring a number of memories that are a linear function of only the number of different frequencies in which the computational state is encoded, independent of its temporal duration. We therefore show that quantum memories can be a powerful component for scalable photonic quantum information processing architectures.