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General-Purpose Quantum Simulation with Prethreshold Superconducting Qubits

Emily Pritchett, University of Waterloo, Institute for Quantum Computing

(Session 1 : Thursday from 4:45pm-5:15pm)

Abstract. We introduce a protocol for the fast simulation of n-dimensional quantum systems on n-qubit quantum computers with tunable couplings. A mapping is given between the control parameters of the quantum computer and the matrix elements of an n -dimensional real (but otherwise arbitrary) Hamiltonian that is simulated in the n-dimensional single-excitation subspace of the quantum simulator. A time-dependent energy/time rescaling minimizes the simulation time on hardware having a fixed coherence time. We demonstrate how three tunably coupled superconducting phase qubits can simulate a realistic three-channel molecular collision using this protocol. The method makes a class of general-purpose time-dependent quantum simulation practical with today's sub-thershold-fidelity qubits.