 $, which suppress offdiagonal components of the reduced density matrix, leaving a diagonal mixture of different classical configurations. Gravitational nonlinearities thus provide a minimal mechanism for generating classical stochastic perturbations from inflation. We identify the time when decoherence occurs, which is delayed after horizon crossing due to the weak coupling, and find that Hubblescale modes act as the decohering environment. We also comment on the observational relevance of decoherence and its relation to the squeezing of the quantum state.’]

Right now I am wondering as to whether this can be connected to Crooks fluctuation theorem. (The Jarzynski equality is a special case of Crooks, and the second law is a special case of Jarzynski.) It also makes me want to spend more time reading Fleming’s imposing thesis, which is essentially a textbook on open quantum systems.

Look at how amazing this nested mirror is from Fig 1:
That’s a real optical photograph! And they think that they will cool it to the ground state in the future.

H/t John Preskill, who advises you to take this seriously despite the many problems with previous attempts at finding quantum computation in the brain. See, e.g., Tegmark’s “The importance of quantum decoherence in brain processes”.
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