# High resolution quantum sensing with shaped control pulses

## TL;DR

This paper demonstrates that amplitude-shaped control pulses significantly improve the temporal and spectral resolution of quantum sensing using nitrogen vacancy centers, enabling detection of weak magnetic signals with unprecedented precision.

## Contribution

It introduces a simple method using cosine square envelope pulses to enhance quantum sensing resolution beyond hardware limitations.

## Key findings

- Achieved 0.6 ps timing resolution for interpulse delay.
- Enhanced spectral resolution in magnetic field and NMR detection.
- Method is straightforward and applicable to fast quantum phase gates.

## Abstract

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.