Quantum algorithm for solving linear systems of equations

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Quantum algorithm for linear systems of equations. (2008, background): “[15] shows how to simulate e in time Õ(log(N)st), where the Õ suppresses more slowly-growing terms (included in the supporting material [3]).”
Hierarchical quantum classifiers (2018, background): “Whilst promising, these algorithms also inherit the limitations of HHL, in particular, the requirement that classical data be efficiently prepared in amplitude encoding.”
Quantum algorithms: an overview (2015, unknown): “Assuming these constraints, j x i can be approximately produced in time polynomial in log N , d , and (cid:20) [47, 4].”