Related papers: Characterizing temperature and strain variations with qubit ensembles for their robust coherence protection

Characterizing temperature and strain variations with qubit ensembles for their robust coherence protection

URL: http://arxiv.org/abs/2205.02790v2
Date: Fri, 6 May 2022 03:07:02 GMT
Title: Characterizing temperature and strain variations with qubit ensembles for their robust coherence protection
Authors: Guoqing Wang, Ariel Rebekah Barr, Hao Tang, Mo Chen, Changhao Li, Haowei Xu, Ju Li, and Paola Cappellaro
Abstract summary: Solid-state spin defects with potentially achievable long coherence times are compelling candidates for quantum memories and sensors. We propose an textitunbalanced echo to overcome this challenge by using a second spin to refocus the variation of these interactions. We numerically show that our method can refocus stronger noise variations than our current experiments and a 400-fold coherence improvement for a 25K temperature inhomogeneity.
Score: 18.223998312240592
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: Solid-state spin defects, especially nuclear spins with potentially achievable long coherence times, are compelling candidates for quantum memories and sensors. However, their current performances are still limited by the decoherence due to the variation of their intrinsic quadrupole and hyperfine interactions. We propose an \textit{unbalanced echo} to overcome this challenge by using a second spin to refocus the variation of these interactions, which preserves the quantum information stored in the free evolution. The unbalanced echo can be used to probe the temperature and strain distribution in materials. Experimentally, we demonstrate a 20-fold $T_2^*$ coherence time increase in an ensemble of $\sim10^{10}$ nuclear spins in diamond. Theoretically, we develop first-principles methods to predict these interaction variations and reveal their correlation in large temperature and strain ranges. We numerically show that our method can refocus stronger noise variations than our current experiments and achieves a 400-fold coherence improvement for a 25~K temperature inhomogeneity.

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