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Combinatorial optimisation via highly efficient quantum walks

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arxiv 1912.07353 v2 pith:ZON2GH63 submitted 2019-12-16 quant-ph

Combinatorial optimisation via highly efficient quantum walks

classification quant-ph
keywords quantumcombinatorialefficientoptimisationcircuitctqwshigh-qualityhighly
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We present a highly efficient quantum circuit for performing continuous time quantum walks (CTQWs) over an exponentially large set of combinatorial objects, provided that the objects can be indexed efficiently. CTQWs form the core mixing operation of a generalised version of the Quantum Approximate Optimisation Algorithm, which works by `steering' the quantum amplitude into high-quality solutions. The efficient quantum circuit holds the promise of finding high-quality solutions to certain classes of NP-hard combinatorial problems such as the Travelling Salesman Problem, maximum set splitting, graph partitioning, and lattice path optimisation.

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