Fig. 1: Scheme of the ansatz growing procedure in original and batched ADAPT-VQE.
From: Variational quantum eigensolver techniques for simulating carbon monoxide oxidation
Original ADAPT-VQE adds a single operator with the largest gradient value at each iteration. In our implementation of batched ADAPT-VQE, we add multiple operators with the largest gradients at each step of the ansatz growing procedure; k is the number of gradients that differ from the largest one by less than r time.
