In-situ characterization of qubit drive-phase distortions

Abstract

Reducing errors in quantum gates is critical to the development of quantum computers. To do so, any distortions in the control signals should be identified, however, conventional tools are not always applicable when part of the system is under high vacuum, cryogenic, or microscopic. Here, we demonstrate a method to detect and compensate for amplitude-dependent phase changes, using the qubit itself as a probe. The technique is implemented using a microwave-driven trapped ion qubit, where correcting phase distortions leads to a three-fold improvement in single-qubit gate error, to attain state-of-the-art performance benchmarked at $1.6(4)\times 10^{-6}$ error per Clifford gate.

References in corpus (11)

• Randomized Benchmarking of Quantum Gates
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Cited by in corpus (1)

• Quantum Vector Signal Analyzer: Wideband Electric Field Sensing via Motional Raman Transitions