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Nature Research, Nature Communications, 1(2), 2011

DOI: 10.1038/ncomms1579

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Observation of an anomalous decoherence effect in a quantum bath at room temperature

Journal article published in 2011 by Pu Huang, Xi Kong, Nan Zhao, Fazhan Shi, Pengfei Wang ORCID, Xing Rong, Ren-Bao Liu ORCID, Jiangfeng Du
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Decoherence of quantum objects is critical to modern quantum sciences and technologies. It is generally believed that stronger noises cause faster decoherence. Strikingly, recent theoretical research discovers the opposite case for spins in quantum baths. Here we report experimental observation of the anomalous decoherence effect for the electron spin-1 of a nitrogen-vacancy centre in high-purity diamond at room temperature. We demonstrate that under dynamical decoupling, the double-transition can have longer coherence time than the single-transition, even though the former couples to the nuclear spin bath as twice strongly as the latter does. The excellent agreement between the experimental and the theoretical results confirms the controllability of the weakly coupled nuclear spins in the bath, which is useful in quantum information processing and quantum metrology. ; Comment: 22 pages, related paper at http://arxiv.org/abs/1102.5576