Research on Protecting Quantum Information via Destructive Interference of Correlated Noise

Ulm University

Our research has shown that cross-correlations of noise sources can significantly improve coherence times for quantum memories, sensing and computing.

Decoherence and imperfect control are  crucial challenges for quantum technologies. Common protection strategies rely on noise temporal autocorrelation but they are not optimal if other correlations are present. We develop and demonstrate experimentally a strategy that uses the noise cross-correlation of two fields that drive our quantum system. By carefully detuning the frequency of the second field, the the two noise source interferes destructively, improving tenfold the coherence time of an electron spin of a nitrogen-vacancy center in diamond. Using our method, we surpass the state-of-the-art sensitivity for high frequency quantum sensing, significantly expanding the applicability of noise protection strategies.

The research has been published in Physical Review Letters and can be viewed here (link to: