Robust and efficient in situ quantum control

TL;DR

This paper introduces a robust, efficient in situ quantum control method that uses direct fidelity estimation, suitable for closed-loop systems and scalable to high-dimensional quantum systems.

Contribution

It presents a novel, implementation-independent algorithm for quantum control that is robust, efficient, and requires minimal fidelity experiments per iteration.

Findings

Algorithm is robust to noise

Requires constant fidelity experiments per iteration

Suitable for high-dimensional quantum systems

Abstract

Precision control of quantum systems is the driving force for both quantum technology and the probing of physics at the quantum and nano-scale. We propose an implementation independent method for in situ quantum control that leverages recent advances in the direct estimation of quantum gate fidelity. Our algorithm takes account of the stochasticity of the problem and is suitable for closed-loop control and requires only a constant number of fidelity estimating experiments per iteration independent of the dimension of the control space. It is efficient and robust to both statistical and technical noise.