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Phys Rev Lett. 2009 Jun 26;102(25):253904. Epub 2009 Jun 26.

Quantum and classical correlations in waveguide lattices.

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  • 1Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 76100, Israel.


We study quantum and classical Hanbury Brown-Twiss correlations in waveguide lattices. We develop a theory for the propagation of photon pairs in the lattice, predicting the emergence of nontrivial quantum interferences unique to lattice systems. Experimentally, we observe the classical counterpart of these interferences using intensity-correlation measurements. We discuss the correspondence between the classical and quantum correlations, and consider path-entangled input states which do not have a classical analogue. Our results demonstrate that waveguide lattices can be used as a robust and highly controllable tool for manipulating quantum states, and offer new ways of studying the quantum properties of light.

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