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  • 标题:Multiple transitions between normal and hyperballistic diffusion in quantum walks with time-dependent jumps
  • 本地全文:下载
  • 作者:Marcelo A. Pires ; Giuseppe Di Molfetta ; Sílvio M. Duarte Queirós
  • 期刊名称:Scientific Reports
  • 电子版ISSN:2045-2322
  • 出版年度:2019
  • 卷号:9
  • 期号:1
  • 页码:1-8
  • DOI:10.1038/s41598-019-55642-5
  • 出版社:Springer Nature
  • 摘要:We extend to the gamut of functional forms of the probability distribution of the time-dependent step-length a previous model dubbed Elephant Quantum Walk, which considers a uniform distribution and yields hyperballistic dynamics where the variance grows cubicly with time, σ 2  ∝ t 3 , and a Gaussian for the position of the walker. We investigate this proposal both locally and globally with the results showing that the time-dependent interplay between interference, memory and long-range hopping leads to multiple transitions between dynamical regimes, namely ballistic → diffusive → superdiffusive → ballistic → hyperballistic for non-hermitian coin whereas the first diffusive regime is quelled for implementations using the Hadamard coin. In addition, we observe a robust asymptotic approach to maximal coin-space entanglement.
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