Dissipatively coupled waveguide networks for coherent diffusive photonics
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A photonic circuit is generally described as a structure in which light propagates by unitary exchange and transfers reversibly between channels. In contrast, the term ‘diffusive’ is more akin to a chaotic propagation in scattering media, where light is driven out of coherence towards a thermal mixture. Based on the dynamics of open quantum systems, the combination of these two opposites can result in novel techniques for coherent light control. The crucial feature of these photonic structures is dissipative coupling between modes, via an interaction with a common reservoir. Here, we demonstrate experimentally that such systems can perform optical equalisation to smooth multimode light, or act as a distributor, guiding it into selected channels. Quantum thermodynamically, these systems can act as catalytic coherent reservoirs by performing perfect non-Landauer erasure. For lattice structures, localised stationary states can be supported in the continuum, similar to compacton-like states in conventional flat-band lattices.
Mukherjee , S , Mogilevtsev , D , Slepyan , G Y , Doherty , T H , Thomson , R R & Korolkova , N 2017 , ' Dissipatively coupled waveguide networks for coherent diffusive photonics ' Nature Communications , vol 8 , 1909 . DOI: 10.1038/s41467-017-02048-4
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S.M. and R.R.T. sincerely thank the UK Science and Technology Facilities Council (STFC) for funding this work through ST/N000625/1. We acknowledge support from the EU projects FP7 People 2013 IRSES 612285 CANTOR (G.Ya.S.), Horizon-2020 H2020-MSCA-RISE-2014- 644076 CoExAN (G.Ya.S.) and SUPERTWIN id.686731 (D.M.), the National Academy of Sciences of Belarus programme 'Convergence' (D.M.). T.D. and N.K. acknowledge the support from the Scottish Universities Physics Alliance (SUPA) and the Engineering and Physical Sciences Research Council (EPSRC).
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