Anomalous decoherence effect in a quantum bath

Details Anomalous decoherence effect in a quantum bath Anomalous decoherence effect in a quantum bath

2011-02-28

arxiv.org/abs/1102.5576v1

Phys. Rev. Lett. 106, 217205 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages 3 figures

Scientific paper

10.1103/PhysRevLett.106.217205

Decoherence of quantum objects in noisy environments is important in quantum sciences and technologies. It is generally believed that different processes coupled to the same noise source should have similar decoherence behaviors and stronger noises would cause faster decoherence. Here we show that in a quantum bath, the case can be the opposite. In particular, we predict that the multi-transition of a nitrogen-vacancy center spin-1 in diamond can have longer coherence time than the single-transitions, even though the former suffers twice stronger noises from the nuclear spin bath than the latter. This anomalous decoherence effect is due to manipulation of the bath evolution via flips of the center spin.

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