Quantum decoherence is "well known" process. It is simply defined as a loss of quantum coherence. It is often used as a partial explanation for "collapse of the wave funtion" (wave funtion is collapsed because the particle interacts with environment, other particle or "is observed", ... in other words it is loss of information to environment).
Some smart people claim, decoherence is not sufficient cause for wave function to collapse (https://arxiv.org/pdf/quant-ph/0112095.pdf), so there is most probably something more...
Back to the question. How can particle regain it's wave function? Or more precisely:
- How can particle regain quantum coherence?
- How often it happens in nature?
- What is the distribution of coherent and decoherent particles in Universe (or on earth) ?
- What is the underpinning mechanism in regaining coherence (in simple math terms)?
- Do we have some experiments that do this?
- Can particle regain coherence "spontaneously"?
PS: Sorry for all questions that are stupid (;