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Very recently [Phys. Rev. E 82, 021921 (2010)] a simple mechanism waspresented by which a molecule subjected to forced oscillations, out of thermalequilibrium, can maintain quantum entanglement between two of its quantumdegrees of freedom. Crucially, entanglement can be maintained even in thepresence of very intense noise, so intense that no entanglement is possiblewhen the forced oscillations cease. This mechanism may allow for the presenceof non-trivial quantum entanglement in biological systems. Here wesignificantly enlarge the study of this model. In particular, we show that thepersistent generation of dynamic entanglement is not restricted to the bosonicheat bath model, but it can also be observed in other decoherence models, e.g.the spin gas model, and in non-Markovian scenarios. We also show howconformational changes can be used by an elementary machine to generateentanglement even in unfavorable conditions. In biological systems, similarmechanisms could be exploited by more complex molecular machines or motors.

Persistent dynamic entanglement from classical motion: How bio-molecular machines can generate non-trivial quantum states