Enhanced solid-state multi-spin metrology using dynamical decoupling

TL;DR

This paper demonstrates that multi-pulse dynamical decoupling significantly extends the coherence lifetime of NV center spins in diamond, enabling improved multi-spin quantum sensing and metrology at room temperature.

Contribution

The study introduces a method to substantially increase multi-spin coherence times in diamond, enhancing the scalability of quantum sensing applications.

Findings

Achieved over 2 ms coherence time for NV multi-spins in diamond.

Demonstrated ten-fold improvement in AC magnetic field sensing.

Extended multi-spin T2 by an order of magnitude across different samples.

Abstract

We use multi-pulse dynamical decoupling to increase the coherence lifetime (T2) of large numbers of nitrogen-vacancy (NV) electronic spins in room temperature diamond, thus enabling scalable applications of multi-spin quantum information processing and metrology. We realize an order-of-magnitude extension of the NV multi-spin T2 for diamond samples with widely differing spin environments. For samples with nitrogen impurity concentration <~1 ppm, we find T2 > 2 ms, comparable to the longest coherence time reported for single NV centers, and demonstrate a ten-fold enhancement in NV multi-spin sensing of AC magnetic fields.