Enhancing coherent transport in a photonic network using controllable decoherence

Devon N. Biggerstaff, René Heilmann, Aidan A. Zecevik, Markus Gräfe, Matthew A. Broome, Alessandro Fedrizzi, Stefan Nolte, Alexander Szameit, Andrew G. White and Ivan Kassal ()
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Devon N. Biggerstaff: Centre for Engineered Quantum Systems and Centre for Quantum Computation and Communication Technology, School of Mathematics and Physics, The University of Queensland
René Heilmann: Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller Universität Jena
Aidan A. Zecevik: Centre for Engineered Quantum Systems and Centre for Quantum Computation and Communication Technology, School of Mathematics and Physics, The University of Queensland
Markus Gräfe: Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller Universität Jena
Matthew A. Broome: Centre for Engineered Quantum Systems and Centre for Quantum Computation and Communication Technology, School of Mathematics and Physics, The University of Queensland
Alessandro Fedrizzi: Centre for Engineered Quantum Systems and Centre for Quantum Computation and Communication Technology, School of Mathematics and Physics, The University of Queensland
Stefan Nolte: Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller Universität Jena
Alexander Szameit: Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller Universität Jena
Andrew G. White: Centre for Engineered Quantum Systems and Centre for Quantum Computation and Communication Technology, School of Mathematics and Physics, The University of Queensland
Ivan Kassal: Centre for Engineered Quantum Systems and Centre for Quantum Computation and Communication Technology, School of Mathematics and Physics, The University of Queensland

Nature Communications, 2016, vol. 7, issue 1, 1-6

Abstract: Abstract Transport phenomena on a quantum scale appear in a variety of systems, ranging from photosynthetic complexes to engineered quantum devices. It has been predicted that the efficiency of coherent transport can be enhanced through dynamic interaction between the system and a noisy environment. We report an experimental simulation of environment-assisted coherent transport, using an engineered network of laser-written waveguides, with relative energies and inter-waveguide couplings tailored to yield the desired Hamiltonian. Controllable-strength decoherence is simulated by broadening the bandwidth of the input illumination, yielding a significant increase in transport efficiency relative to the narrowband case. We show integrated optics to be suitable for simulating specific target Hamiltonians as well as open quantum systems with controllable loss and decoherence.

Date: 2016
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DOI: 10.1038/ncomms11282

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