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Noise-enhanced quantum transport on a closed loop using quantum walks

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Abstract

We study the effect of noise on the transport of a quantum state from a closed loop of \(n\)-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.

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Acknowledgments

We would like to acknowledge valuable discussions with J. Goold and R. Dorner. This project was supported by Science Foundation Ireland under Project No. 10/IN.1/I2979.

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Authors and Affiliations

  1. Physics Department, University College Cork, Cork, Ireland

    C. M. Chandrashekar & Thomas Busch

  2. Quantum Systems Unit, Okinawa Institute of Science and Technology Graduate University, Okinawa , 904-0495, Japan

    C. M. Chandrashekar & Thomas Busch

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  1. C. M. Chandrashekar
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  2. Thomas Busch
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Correspondence to C. M. Chandrashekar.

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Chandrashekar, C.M., Busch, T. Noise-enhanced quantum transport on a closed loop using quantum walks. Quantum Inf Process 13, 1313–1329 (2014). https://doi.org/10.1007/s11128-014-0730-1

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