Improving readout of a superconducting qubit using the path signature method

Abstract

One major challenge in quantum computing is to implement fast, high-accuracy quantum state readout. For superconducting circuits, this problem reduces to a time series classification problem [1]. We propose that using path signature methods to extract features can enhance existing techniques for quantum state discrimination [2]. We demonstrate the superior performance of our proposed approach over conventional methods in distinguishing three different quantum states on real experimental data from a superconducting transmon qubit