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Phys Rev Lett. 2014 Sep 26;113(13):130502. Epub 2014 Sep 25.

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

Author information

1
Department of Physics, Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, United Kingdom.
2
Department of Physics, Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, United Kingdom and Dipartimento di Scienze, Universit degli Studi Roma Tre, Via della Vasca Navale 84, 00154 Rome, Italy.

Abstract

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.

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