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Controlled quantum search on structured databases
oleh: Yunkai Wang, Shengjun Wu, Wei Wang
Format: | Article |
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Diterbitkan: | American Physical Society 2019-10-01 |
Deskripsi
By proposing two schemes (namely, a multistage and a single-stage one) based on the continuous-time quantum walk (CTQW), we study the quantum search on balanced trees of height r with N vertices. For the multistage scheme, we achieve the search for a marked leaf vertex with a runtime Θ(N^{(2r−1)/2r}) and a success probability close to 100% when the branching factor is large. For the single-stage scheme with adjustable edge weights, we achieve the search with an optimal runtime Θ(sqrt[N]) and a success probability close to 100% as well. Furthermore, we show that our search algorithms also work for real trees with unbalanced structures and are quite robust against various kinds of small perturbations.