Training of quantum circuits on a hybrid quantum computer
We train generative modeling circuits on a quantum hybrid computer showing an optimization strategy and a resource trade off. Generative modeling is a flavor of machine learning with applications ranging from computer vision to chemical design. It is expected to be one of the techniques most suited to take advantage of the additional resources provided by near term quantum computers. Here, we implement a data driven quantum circuit training algorithm on the canonical Bars and Stripes dataset using a quantum classical hybrid machine. The training proceeds by running parameterized circuits on a trapped ion quantum computer and feeding the results to a classical optimizer. We apply two separate strategies, Particle Swarm and Bayesian optimization to this task. We show that the convergence of the quantum circuit to the target distribution depends critically on both the quantum hardware and classical optimization strategy. Our study represents the first successful training of a high dimensional universal quantum circuit and highlights the promise and challenges associated with hybrid learning schemes.
Science Advances