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We study the effect of noise on the transport of a quantum state from a closed loop of $$n$$ n -sites with one of the sites as a sink. Using a discrete-time quantum walk dynamics, we demonstrate that the transport efficiency can be enhanced with noise when the number of sites in the loop is small and reduced when the number of sites in the loop grows. By using the concept of measurement induced disturbance, we identify the regimes in which genuine quantum effects are responsible for the enhanced transport.
Quantum Information Processing – Springer Journals
Published: Jan 28, 2014
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