I read an article today that somwhat confused me. Is this the same as time travel...which I have always thought was a contradiction. Are they talking about reversing law of thermodynamics? In which case I don't know if this is the same as time reversal. Complicated topic....maybe someone can expalin in layman terms. below the link
https://www.express.co.uk/news/science/1099679/time-travel-machine-news-quantum-physics-science-news
Answer
The arrow of time is essentially just a different way of looking at the second law of thermodynamics. Essentially when we see entropy increase we are so "familiar" with it that we associate this with time progressing forward. I would say the arrow of time is a more subjective statement of the second law that relates to our perception.
If, by some mechanism, we observe entropy to decrease, it would look like time is flowing backwards. But this is not really going back in time, or what you would call "time travel". Essentially here the system just "became more ordered", going against the second law and thus appearing to move backwards in time.
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