The quantum search for Time’s origin had an equally mind-boggling conclusion
neowin.net Jun 19, 2026

The quantum search for Time’s origin had an equally mind-boggling conclusion

AI-summarised brief · reviewed before publication

Researchers at the University of Surrey conducted a theoretical study on the direction of time in quantum systems, published in Scientific Reports. The study examined how the "arrow of time" emerges from microscopic physics and found that time-reversal symmetry can remain intact in certain models. The arrow of time refers to the one-way direction from past to future in everyday life, but many fundamental physics equations do not prefer a direction of time. The researchers used open quantum systems and the Markov approximation to study how a direction of time might appear even when the underlying physics does not enforce one. They found that applying the Markov approximation did not break time-reversal symmetry, and the resulting equations of motion remained symmetric in time. The study's findings suggest that while common experience indicates time moves one way, the opposite direction would have been equally possible. The researchers used concepts such as master equations and quantum Brownian motion to describe how probabilities of different quantum states change over time.

💡 Why It Matters

  • · The study's results challenge the common sense idea that time moves in a single direction, revealing that fundamental physics laws can describe systems whether time moves forward or backward.
  • · Time-reversal symmetry has significant implications for understanding irreversible behavior in large-scale systems.