We investigate the application of amplitude-shaped control pulses for enhancing the time and frequency resolution of multipulse quantum sensing sequences. Using the electronic spin of a single nitrogen vacancy center in diamond and up to 10,000 coherent microwave pulses with a cosine square envelope, we demonstrate 0.6 ps timing resolution for the interpulse delay. This represents a refinement by over 3 orders of magnitude compared to the 2 ns hardware sampling. We apply the method for the detection of external AC magnetic fields and nuclear magnetic resonance signals of carbon-13 spins with high spectral resolution. Our method is simple to implement and especially useful for quantum applications that require fast phase gates, many control pulses, and high fidelity.
@article{arxiv.1705.07968,
title = {High resolution quantum sensing with shaped control pulses},
author = {J. Zopes and K. Sasaki and K. S. Cujia and J. M. Boss and K. Chang and T. F. Segawa and K. M. Itoh and C. L. Degen},
journal= {arXiv preprint arXiv:1705.07968},
year = {2018}
}