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• W2894521144 abstract "We address continuous-time quantum walks on graphs, and discuss whether and how quantum-limited measurements on the walker may extract information on the tunnelling amplitude between the nodes of the graphs. For a few remarkable families of graphs, we evaluate the ultimate quantum bound to precision, i.e. we compute the quantum Fisher information (QFI), and assess the performances of incomplete measurements, i.e. measurements performed on a subset of the graph's nodes. We also optimize the QFI over the initial preparation of the walker and find the optimal measurement achieving the ultimate precision in each case. As the topology of the graph is changed, a non-trivial interplay between the connectivity and the achievable precision is uncovered." @default.
• W2894521144 created "2018-10-05" @default.
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• W2894521144 date "2019-02-11" @default.
• W2894521144 modified "2023-09-24" @default.
• W2894521144 title "The walker speaks its graph: global and nearly-local probing of the tunnelling amplitude in continuous-time quantum walks" @default.
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• W2894521144 doi "https://doi.org/10.1088/1751-8121/ab0195" @default.
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