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Generation of nonclassical biphoton states through cascaded quantum walks on a nonlinear chip

Solntsev, Alexander; Setzpfandt, Frank; Clark, Alex S; Wu, Che; Collins, Matthew J; Xiong, Chunle; Schreiber, A; Katzschmann, F; Eilenberger, Falk; Schiek, Roland; Sohler, Wolfgang; Mitchell, A.; Silberhorn, C; Egglenton, Ben; Pertsch, Thomas; Neshev, Dragomir; Sukhorukov, Andrey; Kivshar, Yuri


We demonstrate a nonlinear optical chip that generates photons with reconfigurable nonclassical spatial correlations. We employ a quadratic nonlinear waveguide array, where photon pairs are generated through spontaneous parametric down-conversion and simultaneously spread through quantum walks between the waveguides. Because of the quantum interference of these cascaded quantum walks, the emerging photons can become entangled over multiple waveguide positions. We experimentally observe highly...[Show more]

CollectionsANU Research Publications
Date published: 2014
Type: Journal article
Source: Physical Review X
DOI: 10.1103/PhysRevX.4.031007
Access Rights: Open Access


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