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# PANSATZ: Pulse-based Ansatz for Variational Quantum Algorithms

Dec 2022

We develop and implement a novel pulse-based ansatz, which we call PANSATZ,for more efficient and accurate implementations of variational quantumalgorithms (VQAs) on today's noisy intermediate-scale quantum (NISQ) computers.Our approach is applied to quantum chemistry. Specifically, finding theground-state energy associated with the electron configuration problem, usingthe variational quantum eigensolver (VQE) algorithm for several molecules. Wemanage to achieve chemical accuracy both in simulation for several moleculesand on one of IBM's NISQ devices for the $H_2$ molecule in the STO-3G basis.Our results are compared to a gate-based ansatz and show significant latencyreduction - up to $7\times$ shorter ansatz schedules. We also show that thisansatz has structured adaptivity to the entanglement level required by theproblem.

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