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  • CLEO/Europe and EQEC 2011 Conference Digest
  • OSA Technical Digest (CD) (Optica Publishing Group, 2011),
  • paper EA8_5

Classical Characterisation of Correlated Biphotons in Waveguide Lattices

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Abstract

Discrete light propagation in lattices of evanescently coupled waveguides represents a very elegant and noise-insensitive realisation of continuous-time single-particle quantum random walks [1,2]. On the other hand, two or more indistinguishable walkers exhibit nonclassical correlations, and therefore increase the graph size substantially. Such walks have been proposed and realised for product states of two photons, where each photon is sent into one waveguide in a one-dimensional (1D) lattice [3,4]. Clearly, in a 1D lattice the quantum walker is restricted to only two transverse directions of motion, whereas light propagation in two-dimensional (2D) lattices can lead to a greater number of separate output locations, and thereby extend the graph even further [5]. Moreover, if also path-entangled biphoton input states are considered, a rich variety of photon correlations can be expected, showing bosonic as well as fermionic behaviour [3,6]. Therefore, it is of great interest to investigate the evolution of biphoton states in general 2D lattices.

© 2011 IEEE

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