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The study and control of coherence in quantum systems is one of the mostexciting recent developments in physics. Quantum coherence plays a crucial rolein emerging quantum technologies as well as fundamental experiments. A majorobstacle to the utilization of quantum effects is decoherence, primarily in theform of dephasing that destroys quantum coherence, and leads to effectiveclassical behaviour. We show that there are universal relationships governingdephasing, which constrain the relative rates at which quantum correlations candisappear. These effectively lead to speed limits which become especiallyimportant in multi-partite systems.

Fundamental Speed Limits on Quantum Coherence and Correlation Decay