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Quantum criticality

Noise gets marginal

Thermal noise destroys the fragile correlations that characterize many-body systems at a quantum critical point. Theoretical work now shows that another generic form of noise acts differently: flicker noise may alter some properties of a quantum phase transition, but it can preserve the quantum critical state.

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Figure 1: Impact of thermal (equilibrium) and flicker 1/f (non-equilibrium) noise on a quantum critical point at the critical interaction strength gc.

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Diehl, S. Noise gets marginal. Nature Phys 6, 721–722 (2010). https://doi.org/10.1038/nphys1784

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