The groundbreaking experiment published in Nature in 2019 demonstrated that quantum entanglement can allow time to veer into reverse in microscopic systems.
When two ions are uncorrelated, heat transfers from hot to cold until equilibrium is reached. Conversely, when correlated, the direction of heat transfer can actually be reversed.
Despite our experience of the arrow of time as forward-moving—where disorder, entropy, and information only rise—the experiment illustrates a context where time may behave differently.
The past is represented in various forms of information, but our understanding of the future is merely an extrapolation from prior experiences, shaped by evolving scientific rules.
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