title: Continuous-variable quantum computing in optical time-frequency modes using quantum memories.
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.
authors.affiliation: Department of Physics, Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, United Kingdom.
authors.forename: Peter C
authors.initials: PC
authors.lastname: Humphreys
authors.affiliation: Department of Physics, Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, United Kingdom.
authors.forename: W Steven
authors.initials: WS
authors.lastname: Kolthammer
authors.affiliation: Department of Physics, Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, United Kingdom.
authors.forename: Joshua
authors.initials: J
authors.lastname: Nunn
authors.affiliation: 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.
authors.forename: Marco
authors.initials: M
authors.lastname: Barbieri
authors.affiliation: Department of Physics, Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, United Kingdom.
authors.forename: Animesh
authors.initials: A
authors.lastname: Datta
authors.affiliation: Department of Physics, Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, United Kingdom.
authors.forename: Ian A
authors.initials: IA
authors.lastname: Walmsley