Rocco Team Finds 2 Opposing Arrows of Time in Open Quantum Systems
Updated
Updated · Popular Mechanics · Jun 29
Rocco Team Finds 2 Opposing Arrows of Time in Open Quantum Systems
3 articles · Updated · Popular Mechanics · Jun 29
Summary
Results published in January 2025 indicate open quantum systems can produce two arrows of time pointing in opposite directions, rather than the single direction physicists expected.
Entropy still increases in both directions in the team's framework, with energy dissipating irreversibly into the environment, preserving the second law of thermodynamics even as time's arrow splits.
Rocco said the equations suggest either direction could be equally possible from a given moment, potentially forcing a rethink of assumptions in thermodynamics, quantum mechanics and cosmology.
The finding does not prove ideas such as 2 universes emerging from the Big Bang in opposite temporal directions, but it offers a framework for reexamining how time itself may arise.
Could a mirror universe exist, born from the Big Bang, where time is flowing backward from our own?
If we could travel faster than light, would we experience a universe with three dimensions of time?
If the past and future already exist, is our sense of making choices just a quantum illusion?
Two Arrows of Time: Quantum Discovery Challenges the Unidirectional Flow of Time
Overview
In 2025, Dr. Andrea Rocco and his team at the University of Surrey made a groundbreaking discovery showing that open quantum systems can have two opposing arrows of time. Their research challenges the traditional belief that time only moves forward, revealing that the laws of physics do not actually prefer one direction. By using a mathematical framework involving a memory kernel and a time-discontinuous factor, they showed that time’s one-way flow is not fundamental but can emerge from quantum behavior. This means, in certain quantum systems, time could theoretically move in both directions, reshaping our understanding of time itself.