Zero Fourier modes in circular photonic waveguide networks create a protected subspace that enables perfect state transfer to the diametrically opposite site when the number of sites N equals 4n.
Longhi, Light transfer control and diffraction man- agement in circular fibre waveguide arrays, Journal of Physics B: Atomic, Molecular and Optical Physics40, 4477 (2007)
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Perfect state transfer in quantum photonic networks based on Fourier modes
Zero Fourier modes in circular photonic waveguide networks create a protected subspace that enables perfect state transfer to the diametrically opposite site when the number of sites N equals 4n.