van Apeldoorn, J.T.S.

English

In this dissertation we consider quantum algorithms for convex optimization. We start by considering a black-box setting of convex optimization. In this setting we show that quantum computers require exponentially fewer queries to a membership oracle for a convex set in order to implement a separation oracle for that set. We do so by proving that Jordan's quantum gradient algorithm can also be applied to find sub-gradients of convex Lipschitz functions, even though these functions might not even be differentiable. As a corollary we get a quadraticly faster algorithm for convex optimization using membership queries.As a second set of results we give sub-linear time quantum algorithms for semidefinite optimization by speeding up the iterations of the Arora-Kale algorithm. For the problem of finding approximate Nash equilibria for zero-sum games we then give specific algorithms that improve the error-dependence and only depend on the sparsity of the game, not it's size. These last results yield improved algorithms for linear programming as a corollary.We also show several lower bounds in these settings, matching the upper bounds in most or all parameters

International Migration, Integration and Social Cohesion online publications

A quantum view on convex optimization

https://pure.uva.nl/ws/files/44224479/Thesis.pdf

A quantum view on convex optimization

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International Migration, Integration and Social Cohesion online publications